diff --git a/packages/koi/config/use_config_env.go b/packages/koi/config/use_config_env.go
new file mode 100644
index 00000000..2c69b00e
--- /dev/null
+++ b/packages/koi/config/use_config_env.go
@@ -0,0 +1,30 @@
+package config
+
+import (
+	envUtil "koi/util/env"
+	"strings"
+)
+
+func UseConfigEnv(env *[]string) {
+	if Config.Env == nil {
+		return
+	}
+
+	for _, e := range Config.Env {
+		if len(e) == 0 {
+			continue
+		}
+
+		i := strings.Index(e, "=")
+		var k, v string
+		if i >= 0 {
+			k = e[:i]
+			v = e[i+1:]
+		} else {
+			k = e
+			v = ""
+		}
+
+		envUtil.UseEnv(env, k, v)
+	}
+}
diff --git a/packages/koi/config/useenv.go b/packages/koi/config/useenv.go
deleted file mode 100644
index 6b08ba98..00000000
--- a/packages/koi/config/useenv.go
+++ /dev/null
@@ -1,42 +0,0 @@
-package config
-
-import "strings"
-
-func UseConfigEnv(env []string) []string {
-	if Config.Env == nil {
-		return env
-	}
-
-	for _, eAddSrc := range Config.Env {
-		spl := strings.Split(eAddSrc, "=")
-		if len(spl) == 0 {
-			continue
-		}
-		var eAdd string
-		eKey := spl[0] + "="
-		if len(spl) == 1 {
-			eAdd = eKey
-		} else {
-			eAdd = eAddSrc
-		}
-
-		for {
-			notFound := true
-			for i, e := range env {
-				if strings.HasPrefix(e, eKey) {
-					env = append(env[:i], env[i+1:]...)
-					notFound = false
-					break
-				}
-			}
-
-			if notFound {
-				break
-			}
-		}
-
-		env = append(env, eAdd)
-	}
-
-	return env
-}
diff --git a/packages/koi/daemon/node_cmd.go b/packages/koi/daemon/node_cmd.go
index fed8b76b..457e6cb2 100644
--- a/packages/koi/daemon/node_cmd.go
+++ b/packages/koi/daemon/node_cmd.go
@@ -4,6 +4,7 @@ import (
 	"bufio"
 	"koi/config"
 	"koi/util"
+	envUtil "koi/util/env"
 	l "koi/util/logger"
 	"koi/util/strutil"
 	"koi/util/supcolor"
@@ -81,88 +82,23 @@ func CreateNodeCmd(
 
 	if config.Config.UseDataHome {
 		l.Debug("Now replace HOME/USERPROFILE.")
-		for {
-			notFound := true
-			for i, e := range env {
-				if strings.HasPrefix(e, "HOME=") || strings.HasPrefix(e, "USERPROFILE=") {
-					env = append(env[:i], env[i+1:]...)
-					notFound = false
-					break
-				}
-			}
-
-			if notFound {
-				break
-			}
-		}
-
-		env = append(env, "HOME="+config.Config.InternalHomeDir)
-		env = append(env, "USERPROFILE="+config.Config.InternalHomeDir)
+		envUtil.UseEnv(&env, "HOME", config.Config.InternalHomeDir)
+		envUtil.UseEnv(&env, "USERPROFILE", config.Config.InternalHomeDir)
 		l.Debugf("HOME=%s", config.Config.InternalHomeDir)
 
 		if runtime.GOOS == "windows" {
 			l.Debug("Now replace APPDATA.")
-			for {
-				notFound := true
-				for i, e := range env {
-					if strings.HasPrefix(e, "APPDATA=") {
-						env = append(env[:i], env[i+1:]...)
-						notFound = false
-						break
-					}
-				}
-
-				if notFound {
-					break
-				}
-			}
-
-			roamingPath := filepath.Join(config.Config.InternalHomeDir, "AppData", "Roaming")
-			env = append(env, "APPDATA="+roamingPath)
-			l.Debugf("APPDATA=%s", roamingPath)
-
-			l.Debug("Now replace LOCALAPPDATA.")
-			for {
-				notFound := true
-				for i, e := range env {
-					if strings.HasPrefix(e, "LOCALAPPDATA=") {
-						env = append(env[:i], env[i+1:]...)
-						notFound = false
-						break
-					}
-				}
-
-				if notFound {
-					break
-				}
-			}
-
 			localPath := filepath.Join(config.Config.InternalHomeDir, "AppData", "Local")
-			env = append(env, "LOCALAPPDATA="+localPath)
+			envUtil.UseEnv(&env, "LOCALAPPDATA", localPath)
 			l.Debugf("LOCALAPPDATA=%s", localPath)
 		}
 	}
 
 	if config.Config.UseDataTemp {
 		l.Debug("Now replace TMPDIR/TEMP/TMP.")
-		for {
-			notFound := true
-			for i, e := range env {
-				if strings.HasPrefix(e, "TMPDIR=") || strings.HasPrefix(e, "TEMP=") || strings.HasPrefix(e, "TMP=") {
-					env = append(env[:i], env[i+1:]...)
-					notFound = false
-					break
-				}
-			}
-
-			if notFound {
-				break
-			}
-		}
-
-		env = append(env, "TMPDIR="+config.Config.InternalTempDir)
-		env = append(env, "TEMP="+config.Config.InternalTempDir)
-		env = append(env, "TMP="+config.Config.InternalTempDir)
+		envUtil.UseEnv(&env, "TMPDIR", config.Config.InternalTempDir)
+		envUtil.UseEnv(&env, "TEMP", config.Config.InternalTempDir)
+		envUtil.UseEnv(&env, "TMP", config.Config.InternalTempDir)
 		l.Debugf("TEMP=%s", config.Config.InternalTempDir)
 	}
 
@@ -201,8 +137,8 @@ func CreateNodeCmd(
 	env = append(env, koiEnv)
 	l.Debug(koiEnv)
 
-	env = supcolor.UseEnvironColor(env, supcolor.Stderr)
-	env = config.UseConfigEnv(env)
+	supcolor.UseColorEnv(&env, supcolor.Stderr)
+	config.UseConfigEnv(&env)
 
 	l.Debugf("PWD=%s", dir)
 
diff --git a/packages/koi/util/env/useenv.go b/packages/koi/util/env/useenv.go
new file mode 100644
index 00000000..debcf3a4
--- /dev/null
+++ b/packages/koi/util/env/useenv.go
@@ -0,0 +1,34 @@
+package env
+
+import (
+	"fmt"
+	"strings"
+)
+
+func UseEnv(env *[]string, key string, value string) {
+	RemoveEnv(env, key)
+	*env = append(*env, fmt.Sprintf("%s=%s", key, value))
+}
+
+func RemoveEnv(env *[]string, key string) {
+	removeEnvIntl(env, key)
+	removeEnvIntl(env, strings.ToUpper(key))
+	removeEnvIntl(env, strings.ToLower(key))
+}
+
+func removeEnvIntl(env *[]string, key string) {
+	for {
+		notFound := true
+		for i, e := range *env {
+			if strings.HasPrefix(e, key+"=") {
+				*env = append((*env)[:i], (*env)[i+1:]...)
+				notFound = false
+				break
+			}
+		}
+
+		if notFound {
+			break
+		}
+	}
+}
diff --git a/packages/koi/util/supcolor/use_color_env.go b/packages/koi/util/supcolor/use_color_env.go
new file mode 100644
index 00000000..9831a344
--- /dev/null
+++ b/packages/koi/util/supcolor/use_color_env.go
@@ -0,0 +1,36 @@
+// Package supcolor determine whether the io supports color.
+package supcolor
+
+import (
+	envUtil "koi/util/env"
+	"strconv"
+)
+
+func UseColorEnv(env *[]string, mode int8) {
+	// FORCE_COLOR
+	envUtil.UseEnv(env, "FORCE_COLOR", strconv.Itoa(int(mode)))
+
+	// COLORTERM
+	if mode >= 3 {
+		envUtil.UseEnv(env, "COLORTERM", "truecolor")
+	}
+
+	// TERM
+	if mode >= 3 {
+		envUtil.UseEnv(env, "TERM", "xterm-truecolor")
+	} else if mode == 2 {
+		envUtil.UseEnv(env, "TERM", "xterm-256color")
+	} else if mode == 1 {
+		envUtil.UseEnv(env, "TERM", "xterm-color")
+	} else {
+		envUtil.UseEnv(env, "TERM", "dumb")
+	}
+
+	// CLICOLOR
+	if mode >= 1 {
+		envUtil.UseEnv(env, "CLICOLOR", "1")
+	}
+
+	// TERM_PROGRAM
+	envUtil.UseEnv(env, "TERM_PROGRAM", "Koi")
+}
diff --git a/packages/koi/util/supcolor/usecolor.go b/packages/koi/util/supcolor/usecolor.go
deleted file mode 100644
index 7294b280..00000000
--- a/packages/koi/util/supcolor/usecolor.go
+++ /dev/null
@@ -1,57 +0,0 @@
-// Package supcolor determine whether the io supports color.
-package supcolor
-
-import (
-	"fmt"
-	"strings"
-)
-
-func UseEnvironColor(env []string, mode int8) []string {
-	for {
-		notFound := true
-		for i, e := range env {
-			if strings.HasPrefix(e, "FORCE_COLOR=") ||
-				strings.HasPrefix(e, "COLORTERM=") ||
-				strings.HasPrefix(e, "TERM=") ||
-				strings.HasPrefix(e, "CLICOLOR=") ||
-				strings.HasPrefix(e, "TERM_PROGRAM=") {
-				env = append(env[:i], env[i+1:]...)
-				notFound = false
-				break
-			}
-		}
-
-		if notFound {
-			break
-		}
-	}
-
-	// FORCE_COLOR
-	env = append(env, fmt.Sprintf("FORCE_COLOR=%d", mode))
-
-	// COLORTERM
-	if mode >= 3 {
-		env = append(env, "COLORTERM=truecolor")
-	}
-
-	// TERM
-	if mode >= 3 {
-		env = append(env, "TERM=xterm-truecolor")
-	} else if mode == 2 {
-		env = append(env, "TERM=xterm-256color")
-	} else if mode == 1 {
-		env = append(env, "TERM=xterm-color")
-	} else {
-		env = append(env, "TERM=dumb")
-	}
-
-	// CLICOLOR
-	if mode >= 1 {
-		env = append(env, "CLICOLOR=1")
-	}
-
-	// TERM_PROGRAM
-	env = append(env, "TERM_PROGRAM=Koi")
-
-	return env
-}