diff --git a/config.go b/config.go
index 59ff54a..3ead6f3 100644
--- a/config.go
+++ b/config.go
@@ -28,6 +28,9 @@ type LoadOptions struct {
 
 	// Config name, default: config.yml, and type is YAML
 	Name string
+
+	// AllowEnv is whether to allow environment variables in the config file, default is false.
+	AllowEnv bool
 }
 
 // Load loads the config from the given file path.
@@ -44,8 +47,9 @@ func Load(config any, options ...*LoadOptions) error {
 	fileType := DefaultFileType
 	filepathX := fs.JoinCurrentDir(".config.yml")
 
+	optionsX := &LoadOptions{}
 	if len(options) > 0 && options[0] != nil {
-		optionsX := options[0]
+		optionsX = options[0]
 
 		if optionsX.FilePath != "" {
 			filepathX = optionsX.FilePath
@@ -84,6 +88,10 @@ func Load(config any, options ...*LoadOptions) error {
 	}
 
 	if !fs.IsExist(filepathX) {
+		if optionsX.AllowEnv {
+			return Env(config)
+		}
+
 		return fmt.Errorf("config path (%s) not found", filepathX)
 	}
 
@@ -115,5 +123,13 @@ func Load(config any, options ...*LoadOptions) error {
 
 	tg := tag.New("config", datasource.NewMapDataSource(configDataSource))
 
-	return tg.Decode(config)
+	if err := tg.Decode(config); err != nil {
+		return err
+	}
+
+	if optionsX.AllowEnv {
+		return Env(config)
+	}
+
+	return nil
 }
diff --git a/config_test.go b/config_test.go
index 03ca35a..f161303 100644
--- a/config_test.go
+++ b/config_test.go
@@ -1,6 +1,7 @@
 package config
 
 import (
+	"os"
 	"testing"
 )
 
@@ -33,6 +34,9 @@ type Config struct {
 	Crypto string `config:"crypto"`
 	//
 	Actions map[string]Action `config:"actions"`
+
+	//
+	AllowEnvValue string `config:"allow_env_value" env:"ALLOW_ENV_VALUE"`
 }
 
 type Action struct {
@@ -118,3 +122,18 @@ func TestConfig(t *testing.T) {
 		t.Fatal("actions.action1.socks5 is not empty string")
 	}
 }
+
+func TestConfigAllowEnv(t *testing.T) {
+	var cfg Config
+	os.Setenv("ALLOW_ENV_VALUE", "value_from_env_with_allow_env")
+	if err := Load(&cfg, &LoadOptions{
+		FilePath: "./testdata/config.yml",
+		AllowEnv: true,
+	}); err != nil {
+		t.Fatal(err)
+	}
+
+	if cfg.AllowEnvValue != "value_from_env_with_allow_env" {
+		t.Fatalf("allow_env_value is not value_from_env_with_allow_env, but got %s", cfg.AllowEnvValue)
+	}
+}
diff --git a/env.go b/env.go
new file mode 100644
index 0000000..b1dc63e
--- /dev/null
+++ b/env.go
@@ -0,0 +1,25 @@
+package config
+
+import (
+	"github.com/go-zoox/tag"
+	"github.com/go-zoox/tag/datasource"
+)
+
+// Env loads the config from the environment variables.
+// The config must be a pointer to a struct.
+// Example:
+//
+//	type Config struct {
+//		Host string `env:"HOST"`
+//		Port int `env:"PORT"`
+//	}
+//
+//	var config Config
+//	if err := config.Env(&config); err != nil {
+//		log.Fatal(err)
+//	}
+func Env(config interface{}) error {
+	tg := tag.New("env", datasource.NewEnvSource())
+
+	return tg.Decode(config)
+}
diff --git a/go.mod b/go.mod
index aaa31f2..3724d7a 100644
--- a/go.mod
+++ b/go.mod
@@ -3,10 +3,10 @@ module github.com/go-zoox/config
 go 1.18
 
 require (
-	github.com/go-zoox/core-utils v1.2.9
+	github.com/go-zoox/core-utils v1.3.5
 	github.com/go-zoox/encoding v1.2.1
 	github.com/go-zoox/fs v1.3.13
-	github.com/go-zoox/tag v1.2.2
+	github.com/go-zoox/tag v1.2.7
 )
 
 require (
diff --git a/go.sum b/go.sum
index 76a4a2d..e19dae8 100644
--- a/go.sum
+++ b/go.sum
@@ -12,17 +12,17 @@ github.com/go-playground/universal-translator v0.17.0 h1:icxd5fm+REJzpZx7ZfpaD87
 github.com/go-playground/universal-translator v0.17.0/go.mod h1:UkSxE5sNxxRwHyU+Scu5vgOQjsIJAF8j9muTVoKLVtA=
 github.com/go-playground/validator/v10 v10.4.1 h1:pH2c5ADXtd66mxoE0Zm9SUhxE20r7aM3F26W0hOn+GE=
 github.com/go-playground/validator/v10 v10.4.1/go.mod h1:nlOn6nFhuKACm19sB/8EGNn9GlaMV7XkbRSipzJ0Ii4=
-github.com/go-zoox/core-utils v1.2.9 h1:OEp4BEk/s/DAIqNz2hJC8fQJPlK9UyKz+BjcIwfkATk=
-github.com/go-zoox/core-utils v1.2.9/go.mod h1:Y6izFcxuELrkOen5mTQccCJxJqqPJaZV5dQtUMBdkBM=
+github.com/go-zoox/core-utils v1.3.5 h1:uxnPjUdo20ZCYCJp+1deuoqdMByTTJxQFrMp8e5ty+E=
+github.com/go-zoox/core-utils v1.3.5/go.mod h1:raOOwr2l2sJQyjR0Dg33sg0ry4U1/L2eNTuLFRpUXWs=
 github.com/go-zoox/encoding v1.2.1 h1:38rQRsfL1f1YHZaqsPaGcNMkPnzatnPlYiHioUh9F4A=
 github.com/go-zoox/encoding v1.2.1/go.mod h1:NdcM7Ln73oVW3vJgx3MH4fJknCcdQfq+NgJ0tuCo7tU=
 github.com/go-zoox/fs v1.3.13 h1:fe0uvtXCM+9s51z/CnQ5kxB4hBYaK55tkrE9gq0385U=
 github.com/go-zoox/fs v1.3.13/go.mod h1:wCM+UQkjFTxNjOOCNlGcN3k9FeXXUwn9bFnpyjOn55c=
 github.com/go-zoox/ini v1.0.4 h1:N4mUbAO0juYIRrv3ysjKtpEn/+yQv57eQietsgpkAYQ=
 github.com/go-zoox/ini v1.0.4/go.mod h1:SisQneNLb1EBeZ5bA5GnrJd8FNg372hQrPh+gb3IzV4=
-github.com/go-zoox/tag v1.2.2 h1:MLtfFEEBVwV3HVhgNHXGDl0Xv4h9hj1+6Hx9GaRHvFc=
-github.com/go-zoox/tag v1.2.2/go.mod h1:z9z4iZb/XPE4HwTXJgPIdwgH90c2NysGxIMq9tW+GuU=
-github.com/go-zoox/testify v1.0.0 h1:zXuj+JMcudM/dWk8HgMfCKpGYDcyHbTUBGxH35SGubU=
+github.com/go-zoox/tag v1.2.7 h1:B+TLmlnm21YKZz+Ytmo4aiS1WhOc0pv+9IF2HodrGnM=
+github.com/go-zoox/tag v1.2.7/go.mod h1:r8rpj8j4cFe2d79oXjbEVgy9bVAWUvvgRblYo8tyhig=
+github.com/go-zoox/testify v1.0.2 h1:G5sQ3xm0uwCuytnMhgnqZ5BItCt2DN3n2wLBqlIJEWA=
 github.com/go-zoox/uuid v0.0.1 h1:txqmDavRTq68gzzqWfJQLorFyUp9a7M2lmq2KcwPGPA=
 github.com/go-zoox/uuid v0.0.1/go.mod h1:0/F4LdfLqFdyqOf7aXoiYXRkXHU324JQ5DZEytXYBPM=
 github.com/goccy/go-yaml v1.9.8 h1:5gMyLUeU1/6zl+WFfR1hN7D2kf+1/eRGa7DFtToiBvQ=