diff --git a/kernel/server/serve.go b/kernel/server/serve.go
index 9c11f5e1127..2cce8f2c0be 100644
--- a/kernel/server/serve.go
+++ b/kernel/server/serve.go
@@ -24,8 +24,10 @@ import (
 	"net/http/pprof"
 	"net/url"
 	"os"
+	"os/exec"
 	"path"
 	"path/filepath"
+	"strconv"
 	"strings"
 	"time"
 
@@ -34,6 +36,7 @@ import (
 	"github.com/gin-contrib/sessions"
 	"github.com/gin-contrib/sessions/cookie"
 	"github.com/gin-gonic/gin"
+	goPS "github.com/mitchellh/go-ps"
 	"github.com/mssola/user_agent"
 	"github.com/olahol/melody"
 	"github.com/siyuan-note/logging"
@@ -74,6 +77,11 @@ func Serve(fastMode bool) {
 	serveTemplates(ginServer)
 	api.ServeAPI(ginServer)
 
+	if !fastMode {
+		// 杀掉占用 6806 的已有内核进程
+		killByPort(util.FixedPort)
+	}
+
 	var host string
 	if model.Conf.System.NetworkServe || util.ContainerDocker == util.Container {
 		host = "0.0.0.0"
@@ -451,3 +459,91 @@ func corsMiddleware() gin.HandlerFunc {
 		c.Next()
 	}
 }
+
+func killByPort(port string) {
+	if !isPortOpen(port) {
+		return
+	}
+
+	portJSON := filepath.Join(util.HomeDir, ".config", "siyuan", "port.json")
+	os.RemoveAll(portJSON)
+
+	pid := pidByPort(port)
+	if "" == pid {
+		return
+	}
+
+	pidInt, _ := strconv.Atoi(pid)
+	proc, _ := goPS.FindProcess(pidInt)
+	var name string
+	if nil != proc {
+		name = proc.Executable()
+	}
+	kill(pid)
+	logging.LogInfof("killed process [name=%s, pid=%s]", name, pid)
+}
+
+func isPortOpen(port string) bool {
+	timeout := time.Second
+	conn, err := net.DialTimeout("tcp", net.JoinHostPort("127.0.0.1", port), timeout)
+	if nil != err {
+		return false
+	}
+	if nil != conn {
+		conn.Close()
+		return true
+	}
+	return false
+}
+
+func kill(pid string) {
+	var kill *exec.Cmd
+	if gulu.OS.IsWindows() {
+		kill = exec.Command("cmd", "/c", "TASKKILL /F /PID "+pid)
+	} else {
+		kill = exec.Command("kill", "-9", pid)
+	}
+	gulu.CmdAttr(kill)
+	kill.CombinedOutput()
+}
+
+func pidByPort(port string) (ret string) {
+	if gulu.OS.IsWindows() {
+		cmd := exec.Command("cmd", "/c", "netstat -ano | findstr "+port)
+		gulu.CmdAttr(cmd)
+		data, err := cmd.CombinedOutput()
+		if nil != err {
+			logging.LogErrorf("netstat failed: %s", err)
+			return
+		}
+		output := string(data)
+		lines := strings.Split(output, "\n")
+		for _, l := range lines {
+			if strings.Contains(l, "LISTENING") {
+				l = l[strings.Index(l, "LISTENING")+len("LISTENING"):]
+				l = strings.TrimSpace(l)
+				ret = l
+				return
+			}
+		}
+		return
+	}
+
+	cmd := exec.Command("lsof", "-Fp", "-i", ":"+port)
+	gulu.CmdAttr(cmd)
+	data, err := cmd.CombinedOutput()
+	if nil != err {
+		logging.LogErrorf("lsof failed: %s", err)
+		return
+	}
+	output := string(data)
+	lines := strings.Split(output, "\n")
+	for _, l := range lines {
+		if strings.HasPrefix(l, "p") {
+			l = l[1:]
+			ret = l
+			return
+		}
+	}
+	return
+}
diff --git a/kernel/util/working.go b/kernel/util/working.go
index 6b95693d75c..97f0ec292f1 100644
--- a/kernel/util/working.go
+++ b/kernel/util/working.go
@@ -32,7 +32,6 @@ import (
 
 	"github.com/88250/gulu"
 	figure "github.com/common-nighthawk/go-figure"
-	goPS "github.com/mitchellh/go-ps"
 	"github.com/siyuan-note/httpclient"
 	"github.com/siyuan-note/logging"
 )
@@ -347,71 +346,6 @@ func initMime() {
 	mime.AddExtensionType(".pdf", "application/pdf")
 }
 
-func KillByPort(port string) {
-	if pid := PidByPort(port); "" != pid {
-		pidInt, _ := strconv.Atoi(pid)
-		proc, _ := goPS.FindProcess(pidInt)
-		var name string
-		if nil != proc {
-			name = proc.Executable()
-		}
-		Kill(pid)
-		logging.LogInfof("killed process [name=%s, pid=%s]", name, pid)
-	}
-}
-
-func Kill(pid string) {
-	var kill *exec.Cmd
-	if gulu.OS.IsWindows() {
-		kill = exec.Command("cmd", "/c", "TASKKILL /F /PID "+pid)
-	} else {
-		kill = exec.Command("kill", "-9", pid)
-	}
-	gulu.CmdAttr(kill)
-	kill.CombinedOutput()
-}
-
-func PidByPort(port string) (ret string) {
-	if gulu.OS.IsWindows() {
-		cmd := exec.Command("cmd", "/c", "netstat -ano | findstr "+port)
-		gulu.CmdAttr(cmd)
-		data, err := cmd.CombinedOutput()
-		if nil != err {
-			logging.LogErrorf("netstat failed: %s", err)
-			return
-		}
-		output := string(data)
-		lines := strings.Split(output, "\n")
-		for _, l := range lines {
-			if strings.Contains(l, "LISTENING") {
-				l = l[strings.Index(l, "LISTENING")+len("LISTENING"):]
-				l = strings.TrimSpace(l)
-				ret = l
-				return
-			}
-		}
-		return
-	}
-
-	cmd := exec.Command("lsof", "-Fp", "-i", ":"+port)
-	gulu.CmdAttr(cmd)
-	data, err := cmd.CombinedOutput()
-	if nil != err {
-		logging.LogErrorf("lsof failed: %s", err)
-		return
-	}
-	output := string(data)
-	lines := strings.Split(output, "\n")
-	for _, l := range lines {
-		if strings.HasPrefix(l, "p") {
-			l = l[1:]
-			ret = l
-			return
-		}
-	}
-	return
-}
-
 func initPandoc() {
 	if ContainerStd != Container {
 		return