diff --git a/dubbo-common/src/main/java/org/apache/dubbo/common/constants/ConfigConstants.java b/dubbo-common/src/main/java/org/apache/dubbo/common/constants/ConfigConstants.java
new file mode 100644
index 00000000000..5899641a625
--- /dev/null
+++ b/dubbo-common/src/main/java/org/apache/dubbo/common/constants/ConfigConstants.java
@@ -0,0 +1,175 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.dubbo.common.constants;
+
+/**
+ * ConfigConstants
+ */
+public interface ConfigConstants {
+    // BEGIN dubbo-config-api
+    String CLUSTER_KEY = "cluster";
+
+    String STATUS_KEY = "status";
+
+    String CONTEXTPATH_KEY = "contextpath";
+
+    String LISTENER_KEY = "listener";
+
+    String LAYER_KEY = "layer";
+
+    /**
+     * General
+     */
+    /**
+     * Application name;
+     */
+    String NAME = "name";
+
+    /**
+     * Application owner name;
+     */
+    String OWNER = "owner";
+
+    /**
+     * Running application organization name.
+     */
+    String ORGANIZATION = "organization";
+
+    /**
+     * Application architecture name.
+     */
+    String ARCHITECTURE = "architecture";
+
+    /**
+     * Environment name
+     */
+    String ENVIRONMENT = "environment";
+
+    /**
+     * Test environment key.
+     */
+    String TEST_ENVIRONMENT = "test";
+
+    /**
+     * Development environment key.
+     */
+    String DEVELOPMENT_ENVIRONMENT = "develop";
+
+    /**
+     * Production environment key.
+     */
+    String PRODUCTION_ENVIRONMENT = "product";
+
+    String CONFIG_CLUSTER_KEY = "config.cluster";
+    String CONFIG_NAMESPACE_KEY = "config.namespace";
+    String CONFIG_GROUP_KEY = "config.group";
+    String CONFIG_CHECK_KEY = "config.check";
+
+    String CONFIG_CONFIGFILE_KEY = "config.config-file";
+    String CONFIG_ENABLE_KEY = "config.highest-priority";
+    String CONFIG_TIMEOUT_KEY = "config.timeout";
+    String CONFIG_APPNAME_KEY = "config.app-name";
+
+    String USERNAME_KEY = "username";
+
+    String PASSWORD_KEY = "password";
+
+    String HOST_KEY = "host";
+
+    String PORT_KEY = "port";
+
+    String MULTICAST = "multicast";
+
+    String REGISTER_IP_KEY = "register.ip";
+
+    String DUBBO_IP_TO_REGISTRY = "DUBBO_IP_TO_REGISTRY";
+
+    String DUBBO_PORT_TO_REGISTRY = "DUBBO_PORT_TO_REGISTRY";
+
+    String DUBBO_IP_TO_BIND = "DUBBO_IP_TO_BIND";
+
+    String DUBBO_PORT_TO_BIND = "DUBBO_PORT_TO_BIND";
+
+    String SCOPE_KEY = "scope";
+
+    String SCOPE_LOCAL = "local";
+
+    String SCOPE_REMOTE = "remote";
+
+    String SCOPE_NONE = "none";
+
+    String ON_CONNECT_KEY = "onconnect";
+
+    String ON_DISCONNECT_KEY = "ondisconnect";
+
+    String ON_INVOKE_METHOD_KEY = "oninvoke.method";
+
+    String ON_RETURN_METHOD_KEY = "onreturn.method";
+
+    String ON_THROW_METHOD_KEY = "onthrow.method";
+
+    String ON_INVOKE_INSTANCE_KEY = "oninvoke.instance";
+
+    String ON_RETURN_INSTANCE_KEY = "onreturn.instance";
+
+    String ON_THROW_INSTANCE_KEY = "onthrow.instance";
+
+    @Deprecated
+    String SHUTDOWN_WAIT_SECONDS_KEY = "dubbo.service.shutdown.wait.seconds";
+
+    String SHUTDOWN_WAIT_KEY = "dubbo.service.shutdown.wait";
+
+    /**
+     * The key name for export URL in register center
+     */
+    String EXPORT_KEY = "export";
+
+    /**
+     * The key name for reference URL in register center
+     */
+    String REFER_KEY = "refer";
+
+    /**
+     * To decide whether to make connection when the client is created
+     */
+    String LAZY_CONNECT_KEY = "lazy";
+
+    String DUBBO_PROTOCOL = "dubbo";
+
+    String ZOOKEEPER_PROTOCOL = "zookeeper";
+
+    // FIXME: is this still useful?
+    String SHUTDOWN_TIMEOUT_KEY = "shutdown.timeout";
+
+    int DEFAULT_SHUTDOWN_TIMEOUT = 1000 * 60 * 15;
+
+    String PROTOCOLS_SUFFIX = "dubbo.protocols.";
+
+    String PROTOCOL_SUFFIX = "dubbo.protocol.";
+
+    String REGISTRIES_SUFFIX = "dubbo.registries.";
+
+    String TELNET = "telnet";
+
+    String QOS_ENABLE = "qos.enable";
+
+    String QOS_PORT = "qos.port";
+
+    String ACCEPT_FOREIGN_IP = "qos.accept.foreign.ip";
+    // END dubbo-congfig-api
+}
diff --git a/dubbo-common/src/main/java/org/apache/dubbo/common/constants/RemotingConstants.java b/dubbo-common/src/main/java/org/apache/dubbo/common/constants/RemotingConstants.java
new file mode 100644
index 00000000000..4e50feea1c9
--- /dev/null
+++ b/dubbo-common/src/main/java/org/apache/dubbo/common/constants/RemotingConstants.java
@@ -0,0 +1,154 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.dubbo.common.constants;
+
+import java.util.concurrent.ExecutorService;
+
+/**
+ * RemotingConstants
+ */
+public interface RemotingConstants {
+
+    String PAYLOAD_KEY = "payload";
+    /**
+     * 8M
+     */
+    int DEFAULT_PAYLOAD = 8 * 1024 * 1024;
+
+    String BUFFER_KEY = "buffer";
+
+    /**
+     * default buffer size is 8k.
+     */
+    int DEFAULT_BUFFER_SIZE = 8 * 1024;
+
+    int MAX_BUFFER_SIZE = 16 * 1024;
+
+    int MIN_BUFFER_SIZE = 1 * 1024;
+
+    String CONNECT_TIMEOUT_KEY = "connect.timeout";
+
+    int DEFAULT_CONNECT_TIMEOUT = 3000;
+
+    String HEARTBEAT_KEY = "heartbeat";
+
+    int DEFAULT_HEARTBEAT = 60 * 1000;
+
+    String IDLE_TIMEOUT_KEY = "idle.timeout";
+
+    int DEFAULT_IDLE_TIMEOUT = 600 * 1000;
+
+    String ACCEPTS_KEY = "accepts";
+
+    int DEFAULT_ACCEPTS = 0;
+
+    String SERIALIZATION_KEY = "serialization";
+
+    String DEFAULT_REMOTING_SERIALIZATION = "hessian2";
+
+    String CODEC_KEY = "codec";
+
+    String DEFAULT_REMOTING_CODEC = "dubbo";
+
+    String SERVER_KEY = "server";
+
+    String DEFAULT_REMOTING_SERVER = "netty";
+
+    String CLIENT_KEY = "client";
+
+    String DEFAULT_REMOTING_CLIENT = "netty";
+
+    String TRANSPORTER_KEY = "transporter";
+
+    String DEFAULT_TRANSPORTER = "netty";
+
+    String EXCHANGER_KEY = "exchanger";
+
+    String DEFAULT_EXCHANGER = "header";
+
+    String DISPACTHER_KEY = "dispacther";
+
+    int DEFAULT_IO_THREADS = Math.min(Runtime.getRuntime().availableProcessors() + 1, 32);
+
+    String BIND_IP_KEY = "bind.ip";
+
+    String BIND_PORT_KEY = "bind.port";
+
+    String SENT_KEY = "sent";
+
+    boolean DEFAULT_SENT = false;
+
+    String DISPATCHER_KEY = "dispatcher";
+
+    String CHANNEL_HANDLER_KEY = "channel.handler";
+
+    String DEFAULT_CHANNEL_HANDLER = "default";
+
+    String SERVICE_DESCIPTOR_KEY = "serviceDescriptor";
+
+    String CONNECT_QUEUE_CAPACITY = "connect.queue.capacity";
+
+    String CONNECT_QUEUE_WARNING_SIZE = "connect.queue.warning.size";
+
+    int DEFAULT_CONNECT_QUEUE_WARNING_SIZE = 1000;
+
+    String CHANNEL_ATTRIBUTE_READONLY_KEY = "channel.readonly";
+
+    String CHANNEL_READONLYEVENT_SENT_KEY = "channel.readonly.sent";
+
+    String CHANNEL_SEND_READONLYEVENT_KEY = "channel.readonly.send";
+
+    String EXECUTOR_SERVICE_COMPONENT_KEY = ExecutorService.class.getName();
+
+    String CHARSET_KEY = "charset";
+
+    String DEFAULT_CHARSET = "UTF-8";
+
+    String BACKUP_KEY = "backup";
+
+    /**
+     * Every heartbeat duration / HEATBEAT_CHECK_TICK, check if a heartbeat should be sent. Every heartbeat timeout
+     * duration / HEATBEAT_CHECK_TICK, check if a connection should be closed on server side, and if reconnect on
+     * client side
+     */
+    int HEARTBEAT_CHECK_TICK = 3;
+
+    /**
+     * the least heartbeat during is 1000 ms.
+     */
+    long LEAST_HEARTBEAT_DURATION = 1000;
+
+    /**
+     * ticks per wheel.
+     */
+    int TICKS_PER_WHEEL = 128;
+
+    String HEARTBEAT_TIMEOUT_KEY = "heartbeat.timeout";
+
+    String RECONNECT_KEY = "reconnect";
+
+    int DEFAULT_RECONNECT_PERIOD = 2000;
+
+    String SEND_RECONNECT_KEY = "send.reconnect";
+
+    String CHECK_KEY = "check";
+
+    String PROMPT_KEY = "prompt";
+
+    String DEFAULT_PROMPT = "dubbo>";
+}
diff --git a/dubbo-common/src/main/java/org/apache/dubbo/common/constants/RpcConstants.java b/dubbo-common/src/main/java/org/apache/dubbo/common/constants/RpcConstants.java
new file mode 100644
index 00000000000..9e7302ff0ad
--- /dev/null
+++ b/dubbo-common/src/main/java/org/apache/dubbo/common/constants/RpcConstants.java
@@ -0,0 +1,195 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.dubbo.common.constants;
+
+/**
+ * RpcConstants
+ */
+public interface RpcConstants {
+    // BEGIN dubbo-rpc-hessian
+    String HESSIAN2_REQUEST_KEY = "hessian2.request";
+
+    boolean DEFAULT_HESSIAN2_REQUEST = false;
+
+    String HESSIAN_OVERLOAD_METHOD_KEY = "hessian.overload.method";
+
+    boolean DEFAULT_HESSIAN_OVERLOAD_METHOD = false;
+
+    String DEFAULT_HTTP_CLIENT = "jdk";
+
+    String DEFAULT_HTTP_SERVER = "servlet";
+
+    String DEFAULT_HTTP_SERIALIZATION = "json";
+    // END dubbo-rpc-hessian
+
+    // BEGIN dubbo-rpc-dubbo
+    String SHARE_CONNECTIONS_KEY = "shareconnections";
+
+    /**
+     * By default, a consumer JVM instance and a provider JVM instance share a long TCP connection (except when connections are set),
+     * which can set the number of long TCP connections shared to avoid the bottleneck of sharing a single long TCP connection.
+     */
+    String DEFAULT_SHARE_CONNECTIONS = "1";
+
+    String INPUT_KEY = "input";
+
+    String OUTPUT_KEY = "output";
+
+    String DECODE_IN_IO_THREAD_KEY = "decode.in.io";
+
+    boolean DEFAULT_DECODE_IN_IO_THREAD = true;
+
+    /**
+     * callback inst id
+     */
+    String CALLBACK_SERVICE_KEY = "callback.service.instid";
+
+    /**
+     * The limit of callback service instances for one interface on every client
+     */
+    String CALLBACK_INSTANCES_LIMIT_KEY = "callbacks";
+
+    /**
+     * The default limit number for callback service instances
+     *
+     * @see #CALLBACK_INSTANCES_LIMIT_KEY
+     */
+    int DEFAULT_CALLBACK_INSTANCES = 1;
+
+    String CALLBACK_SERVICE_PROXY_KEY = "callback.service.proxy";
+
+    String IS_CALLBACK_SERVICE = "is_callback_service";
+
+    /**
+     * Invokers in channel's callback
+     */
+    String CHANNEL_CALLBACK_KEY = "channel.callback.invokers.key";
+
+    /**
+     * The initial state for lazy connection
+     */
+    String LAZY_CONNECT_INITIAL_STATE_KEY = "connect.lazy.initial.state";
+
+    /**
+     * The default value of lazy connection's initial state: true
+     *
+     * @see #LAZY_CONNECT_INITIAL_STATE_KEY
+     */
+    boolean DEFAULT_LAZY_CONNECT_INITIAL_STATE = true;
+
+    String OPTIMIZER_KEY = "optimizer";
+    // END dubbo-rpc-dubbo
+
+
+    // BEGIN dubbo-rpc-api
+    String DUBBO_VERSION_KEY = "dubbo";
+
+    String LOCAL_KEY = "local";
+
+    String STUB_KEY = "stub";
+
+    String MOCK_KEY = "mock";
+
+    String DEPRECATED_KEY = "deprecated";
+
+    String $INVOKE = "$invoke";
+
+    String $ECHO = "$echo";
+
+    String RETURN_PREFIX = "return ";
+
+    String THROW_PREFIX = "throw";
+
+    String FAIL_PREFIX = "fail:";
+
+    String FORCE_PREFIX = "force:";
+
+    String MERGER_KEY = "merger";
+
+    String IS_SERVER_KEY = "isserver";
+
+    String FORCE_USE_TAG = "dubbo.force.tag";
+
+    String GENERIC_SERIALIZATION_NATIVE_JAVA = "nativejava";
+
+    String GENERIC_SERIALIZATION_DEFAULT = "true";
+
+    String GENERIC_SERIALIZATION_BEAN = "bean";
+
+    String GENERIC_SERIALIZATION_PROTOBUF = "protobuf-json";
+
+    String TPS_LIMIT_RATE_KEY = "tps";
+
+    String TPS_LIMIT_INTERVAL_KEY = "tps.interval";
+
+    long DEFAULT_TPS_LIMIT_INTERVAL = 60 * 1000;
+
+    String AUTO_ATTACH_INVOCATIONID_KEY = "invocationid.autoattach";
+
+    String STUB_EVENT_KEY = "dubbo.stub.event";
+
+    boolean DEFAULT_STUB_EVENT = false;
+
+    String STUB_EVENT_METHODS_KEY = "dubbo.stub.event.methods";
+
+    String PROXY_KEY = "proxy";
+
+    String EXECUTES_KEY = "executes";
+
+    String REFERENCE_FILTER_KEY = "reference.filter";
+
+    String INVOKER_LISTENER_KEY = "invoker.listener";
+
+    String SERVICE_FILTER_KEY = "service.filter";
+
+    String EXPORTER_LISTENER_KEY = "exporter.listener";
+
+    String ACCESS_LOG_KEY = "accesslog";
+
+    String ACTIVES_KEY = "actives";
+
+    String CONNECTIONS_KEY = "connections";
+
+    String ID_KEY = "id";
+
+    String ASYNC_KEY = "async";
+
+    String FUTURE_GENERATED_KEY = "future_generated";
+
+    String FUTURE_RETURNTYPE_KEY = "future_returntype";
+
+    String RETURN_KEY = "return";
+
+    String TOKEN_KEY = "token";
+
+    String INTERFACES = "interfaces";
+
+    String GENERIC_KEY = "generic";
+
+    String LOCAL_PROTOCOL = "injvm";
+    // END dubbo-rpc-api
+
+
+    // BEGIN dubbo-rpc-rest
+    String KEEP_ALIVE_KEY = "keepalive";
+
+    boolean DEFAULT_KEEP_ALIVE = true;
+
+    String EXTENSION_KEY = "extension";
+    // END dubbo-rpc-rest
+}