diff --git a/README.md b/README.md
index 8bdda24..47137ff 100644
--- a/README.md
+++ b/README.md
@@ -2,6 +2,8 @@
 [![Minimum PHP Version](https://img.shields.io/badge/php-%3E%3D%205.6-8892BF.svg)](https://php.net/)
 [![License](https://img.shields.io/github/license/jukylin/jaeger-php.svg)](https://github.com/jukylin/jaeger-php/blob/master/LICENSE)
 [![Coverage Status](https://coveralls.io/repos/github/jukylin/jaeger-php/badge.svg?branch=master)](https://coveralls.io/github/jukylin/jaeger-php?branch=master)
+[![Latest Stable Version](https://img.shields.io/packagist/v/jukylin/jaeger-php.svg)](https://packagist.org/packages/jukylin/jaeger-php)
+
 # jaeger-php
 
 ## principle of Distributed Tracing
@@ -68,7 +70,7 @@ $clientTrace->inject($clientSapn1->spanContext, Formats\TEXT_MAP, $_SERVER);
 
 ```
 //can search in Jaeger UI
-$span->addTags(['http.status' => "200"]);
+$span->setTag('http.status', "200");
 
 //log record
 $span->log(['error' => "HTTP request timeout"]);
diff --git a/example/HTTP.php b/example/HTTP.php
index ba3fa96..191af52 100644
--- a/example/HTTP.php
+++ b/example/HTTP.php
@@ -37,7 +37,7 @@
 $serverSpan->addBaggageItem("version", "1.8.9");
 print_r($serverSpan->getContext());
 $tracer->inject($serverSpan->getContext(), Formats\TEXT_MAP, $_SERVER);
-print_r($_SERVER);exit;
+
 //init server span end
 $clientTracer = $config->initTracer('HTTP');
 
@@ -52,8 +52,10 @@
 $client = new Client();
 $res = $client->request($method, $url,['headers' => $injectTarget1]);
 
-$clientSapn1->setTags(['http.status_code' => 200
-    , 'http.method' => 'GET', 'http.url' => $url]);
+$clientSapn1->setTag('http.status_code', 200);
+$clientSapn1->setTag('http.method', 'GET');
+$clientSapn1->setTag('http.url', $url);
+
 $clientSapn1->log(['message' => "HTTP1 ". $method .' '. $url .' end !']);
 $clientSapn1->finish();
 //client span1 end
@@ -74,8 +76,10 @@
 $client = new Client();
 $res = $client->request($method, $url, ['headers' => $injectTarget2]);
 
-$clientSpan2->setTags(['http.status_code' => 200
-    , 'http.method' => 'GET', 'http.url' => $url]);
+$clientSpan2->setTag('http.status_code', 200);
+$clientSpan2->setTag('http.method', 'GET');
+$clientSpan2->setTag('http.url', $url);
+
 $clientSpan2->log(['message' => "HTTP2 ". $method .' '. $url .' end !']);
 $clientSpan2->finish();
 //client span2 end
diff --git a/example/HTTP2.php b/example/HTTP2.php
index 3d263a6..c217498 100644
--- a/example/HTTP2.php
+++ b/example/HTTP2.php
@@ -13,7 +13,7 @@
 //init server span start
 $config = Config::getInstance();
 
-$tracer = $config->initTrace('example', '0.0.0.0:6831');
+$tracer = $config->initTracer('example', '0.0.0.0:6831');
 
 $top = $tracer->startActiveSpan('level top');
 $second = $tracer->startActiveSpan('level second');
diff --git a/example/Hprose.php b/example/Hprose.php
index 900263b..a9921db 100644
--- a/example/Hprose.php
+++ b/example/Hprose.php
@@ -49,8 +49,8 @@
         $client->setHeader($key, $val);
     }
 }
-$clientSapn->setTags(['http.url' => $url]);
-$clientSapn->setTags(['http.method' => 'POST']);
+$clientSapn->setTag('http.url', $url);
+$clientSapn->setTag('http.method' , 'POST');
 
 $result =  $client->get("Hprose");
 
diff --git a/example/Istio1.php b/example/Istio1.php
index 07abe80..f305de3 100644
--- a/example/Istio1.php
+++ b/example/Istio1.php
@@ -40,9 +40,9 @@
     $clientTracer->inject($clientSapn->spanContext, Formats\TEXT_MAP, $injectTarget);
 
     $client = new Client();
-    $clientSapn->setTags(["http.url" => "Istio2:8001"]);
+    $clientSapn->setTag("http.url", "Istio2:8001");
     $res = $client->request('GET', 'Istio2:8001' ,['headers' => $injectTarget]);
-    $clientSapn->setTags(["http.status_code" => $res->getStatusCode()]);
+    $clientSapn->setTag("http.status_code", $res->getStatusCode());
     //client span1 end
 
     //server span end
diff --git a/example/Istio2.php b/example/Istio2.php
index 452daa0..f543c88 100644
--- a/example/Istio2.php
+++ b/example/Istio2.php
@@ -38,9 +38,9 @@
     $clientTracer->inject($clientSapn->spanContext, Formats\TEXT_MAP, $injectTarget);
 
     $client = new \GuzzleHttp\Client();
-    $clientSapn->setTags(["http.url" => "Istio3:8002"]);
+    $clientSapn->setTag("http.url", "Istio3:8002");
     $res = $client->request('GET', 'Istio3:8002', ['headers' => $injectTarget]);
-    $clientSapn->setTags(["http.status_code" => $res->getStatusCode()]);
+    $clientSapn->setTag("http.status_code", $res->getStatusCode());
     //client span1 end
 
     //server span end
diff --git a/src/Jaeger/Jaeger.php b/src/Jaeger/Jaeger.php
index 2b75c09..ea5cffd 100644
--- a/src/Jaeger/Jaeger.php
+++ b/src/Jaeger/Jaeger.php
@@ -116,8 +116,11 @@ public function startSpan($operationName, $options = []){
         }
 
         $span = new Span($operationName, $newSpan, $options->getReferences());
-        $span->setTags($options->getTags());
-
+        if(!empty($options->getTags())) {
+            foreach ($options->getTags() as $k => $tag) {
+                $span->setTag($k, $tag);
+            }
+        }
         if($newSpan->isSampled() == 1) {
             $this->spans[] = $span;
         }
diff --git a/src/Jaeger/Span.php b/src/Jaeger/Span.php
index e693376..4c32601 100644
--- a/src/Jaeger/Span.php
+++ b/src/Jaeger/Span.php
@@ -75,19 +75,6 @@ public function overwriteOperationName($newOperationName){
         $this->operationName = $newOperationName;
     }
 
-    /**
-     * Adds tags to the Span in key:value format, key must be a string and tag must be either
-     * a string, a boolean value, or a numeric type.
-     *
-     * As an implementor, consider using "standard tags" listed in {@see \OpenTracing\Ext\Tags}
-     *
-     * @param array $tags
-     * @throws SpanAlreadyFinished if the span is already finished
-     */
-    public function setTags(array $tags){
-        $this->tags = array_merge($this->tags, $tags);
-    }
-
 
     public function setTag($key, $value){
         $this->tags[$key] = $value;
diff --git a/tests/SpanTest.php b/tests/SpanTest.php
index 04bc4fc..7a09e08 100644
--- a/tests/SpanTest.php
+++ b/tests/SpanTest.php
@@ -31,14 +31,14 @@ public function testOverwriteOperationName(){
 
     public function testAddTags(){
         $span = new Span('test', new NoopSpanContext(), []);
-        $span->setTags(['test' => 'test']);
+        $span->setTag('test', 'test');
         $this->assertTrue((isset($span->tags['test']) && $span->tags['test'] == 'test'));
     }
 
 
     public function testFinish(){
         $span = new Span('test', new NoopSpanContext(), []);
-        $span->setTags(['test' => 'test']);
+        $span->setTag('test', 'test');
         $span->finish();
         $this->assertTrue(!empty($span->finishTime) && !empty($span->duration));
     }