diff --git a/backend/internal/config/config.go b/backend/internal/config/config.go
index 3e336ab8..861351de 100644
--- a/backend/internal/config/config.go
+++ b/backend/internal/config/config.go
@@ -866,7 +866,7 @@ func setDefaults() {
 
 	// Log
 	viper.SetDefault("log.level", "info")
-	viper.SetDefault("log.format", "json")
+	viper.SetDefault("log.format", "console")
 	viper.SetDefault("log.service_name", "sub2api")
 	viper.SetDefault("log.env", "production")
 	viper.SetDefault("log.caller", true)
diff --git a/backend/internal/pkg/logger/options.go b/backend/internal/pkg/logger/options.go
index c14bb41a..efcd701c 100644
--- a/backend/internal/pkg/logger/options.go
+++ b/backend/internal/pkg/logger/options.go
@@ -53,7 +53,7 @@ func (o InitOptions) normalized() InitOptions {
 	}
 	out.Format = strings.ToLower(strings.TrimSpace(out.Format))
 	if out.Format == "" {
-		out.Format = "json"
+		out.Format = "console"
 	}
 	out.ServiceName = strings.TrimSpace(out.ServiceName)
 	if out.ServiceName == "" {
diff --git a/deploy/config.example.yaml b/deploy/config.example.yaml
index 2b553321..f016fd49 100644
--- a/deploy/config.example.yaml
+++ b/deploy/config.example.yaml
@@ -296,7 +296,7 @@ log:
   level: "info"
   # Log format: json/console
   # 日志格式：json/console
-  format: "json"
+  format: "console"
   # Service name field written into each log line
   # 每条日志都会附带 service 字段
   service_name: "sub2api"