diff --git a/client.go b/client.go
index dfd9866..44c2660 100644
--- a/client.go
+++ b/client.go
@@ -53,9 +53,9 @@ func (c *Workwx) WithApp(corpSecret string, agentID int64) *WorkwxApp {
 		CorpSecret: corpSecret,
 		AgentID:    agentID,
 
-		accessToken:            &token{mutex: &sync.RWMutex{}},
-		jsapiTicket:            &token{mutex: &sync.RWMutex{}},
-		jsapiTicketAgentConfig: &token{mutex: &sync.RWMutex{}},
+		accessToken:            &token{mutex: &sync.RWMutex{}, logger: c.opts.Logger},
+		jsapiTicket:            &token{mutex: &sync.RWMutex{}, logger: c.opts.Logger},
+		jsapiTicketAgentConfig: &token{mutex: &sync.RWMutex{}, logger: c.opts.Logger},
 	}
 	app.accessToken.setGetTokenFunc(app.getAccessToken)
 	app.jsapiTicket.setGetTokenFunc(app.getJSAPITicket)
diff --git a/client_options.go b/client_options.go
index ef8e27b..2c0ee2c 100644
--- a/client_options.go
+++ b/client_options.go
@@ -10,6 +10,7 @@ const DefaultQYAPIHost = "https://qyapi.weixin.qq.com"
 type options struct {
 	QYAPIHost string
 	HTTP      *http.Client
+	Logger    Logger
 }
 
 // CtorOption 客户端对象构造参数
@@ -22,6 +23,7 @@ func defaultOptions() options {
 	return options{
 		QYAPIHost: DefaultQYAPIHost,
 		HTTP:      &http.Client{},
+		Logger:    newDefaultLogger(),
 	}
 }
 
@@ -62,3 +64,22 @@ var _ CtorOption = (*withHTTPClient)(nil)
 func (x *withHTTPClient) applyTo(y *options) {
 	y.HTTP = x.x
 }
+
+//
+//
+//
+
+type withLogger struct {
+	x Logger
+}
+
+// WithLogger 使用给定的 logger 作为日志打印的方式。
+func WithLogger(logger Logger) CtorOption {
+	return &withLogger{x: logger}
+}
+
+var _ CtorOption = (*withLogger)(nil)
+
+func (x *withLogger) applyTo(y *options) {
+	y.Logger = x.x
+}
diff --git a/client_options_test.go b/client_options_test.go
index 159ea99..d7b7934 100644
--- a/client_options_test.go
+++ b/client_options_test.go
@@ -1,6 +1,7 @@
 package workwx
 
 import (
+	"fmt"
 	"net/http"
 	"testing"
 
@@ -52,3 +53,29 @@ func TestWithQYAPIHost(t *testing.T) {
 		})
 	})
 }
+
+func TestWithLogger(t *testing.T) {
+	c.Convey("给定一个 options", t, func() {
+		opts := options{}
+
+		c.Convey("用 WithLogger 修饰它", func() {
+
+			l := &myLogger{}
+			o := WithLogger(l)
+			o.applyTo(&opts)
+
+			c.Convey("options.Logger 应该变了", func() {
+				c.So(opts.Logger, c.ShouldEqual, l)
+			})
+		})
+	})
+}
+
+type myLogger struct{}
+
+func (*myLogger) Info(msg string) {
+	fmt.Println("INFO: " + msg)
+}
+func (*myLogger) Error(msg string) {
+	fmt.Println("ERROR: " + msg)
+}
diff --git a/logger.go b/logger.go
new file mode 100644
index 0000000..e1e1f94
--- /dev/null
+++ b/logger.go
@@ -0,0 +1,16 @@
+package workwx
+
+type Logger interface {
+	Info(msg string)
+	Error(msg string)
+}
+
+type defaultLogger struct{}
+
+func (l *defaultLogger) Info(msg string) {}
+
+func (l *defaultLogger) Error(msg string) {}
+
+func newDefaultLogger() *defaultLogger {
+	return &defaultLogger{}
+}
diff --git a/token.go b/token.go
index 63620d3..660cfe4 100644
--- a/token.go
+++ b/token.go
@@ -2,6 +2,7 @@ package workwx
 
 import (
 	"context"
+	"fmt"
 	"sync"
 	"time"
 
@@ -18,6 +19,7 @@ type token struct {
 	tokenInfo
 	lastRefresh  time.Time
 	getTokenFunc func() (tokenInfo, error)
+	logger       Logger
 }
 
 // getAccessToken 获取 access token
@@ -150,8 +152,7 @@ func (t *token) tokenRefresher(ctx context.Context) {
 		case <-time.After(waitDuration):
 			retryer := backoff.WithContext(backoff.NewExponentialBackOff(), ctx)
 			if err := backoff.Retry(t.syncToken, retryer); err != nil {
-				// TODO: logging
-				_ = err
+				t.logger.Error(fmt.Sprintf("failed to refresh token: %v. will retry.", err))
 			}
 
 			waitUntilTime := t.lastRefresh.Add(t.expiresIn).Add(-refreshTimeWindow)
@@ -160,6 +161,7 @@ func (t *token) tokenRefresher(ctx context.Context) {
 				waitDuration = minRefreshDuration
 			}
 		case <-ctx.Done():
+			t.logger.Info("tokenRefresher terminated")
 			return
 		}
 	}