diff --git a/README.md b/README.md
index c8aa727..dfbd58b 100644
--- a/README.md
+++ b/README.md
@@ -42,6 +42,7 @@ npm run dev
 
 ## 开发态短信与实名
 
+- 后端日志默认同时输出到控制台和 `backend/logs/app-YYYY-MM-DD.log`，按北京时间自动按天切分；可通过 `LOG_LEVEL=debug|info|warn|error` 调整级别。
 - 短信验证码默认使用 mock 适配器，验证码会打印在后端日志中；生产环境可通过 `SMS_PROVIDER=aliyun` 接入阿里云短信。
 - 阿里云短信需要配置 `ALIYUN_ACCESS_KEY_ID`、`ALIYUN_ACCESS_KEY_SECRET`、`ALIYUN_SMS_SIGN_NAME` 和 `ALIYUN_SMS_LOGIN_TEMPLATE_CODE`，模板变量名默认为 `code`。
 - 实名认证使用 mock 适配器，登录后请求 `POST /api/realname/start`，提交合法姓名和 18 位身份证号会直接通过。
diff --git a/backend/.env.example b/backend/.env.example
index 136b1b4..5991729 100644
--- a/backend/.env.example
+++ b/backend/.env.example
@@ -7,6 +7,12 @@ REDIS_PASSWORD=
 REDIS_DB=0
 
 JWT_SECRET=change-me
+
+LOG_LEVEL=info
+LOG_DIR=logs
+LOG_ENABLE_CONSOLE=true
+LOG_ENABLE_FILE=true
+
 STORAGE_ENDPOINT=http://localhost:9000
 STORAGE_BUCKET=hfb-sys
 STORAGE_ACCESS_KEY_ID=minioadmin
diff --git a/backend/cmd/api/main.go b/backend/cmd/api/main.go
index 717401b..437615b 100644
--- a/backend/cmd/api/main.go
+++ b/backend/cmd/api/main.go
@@ -11,6 +11,7 @@ import (
 	"hfb_sys/backend/internal/config"
 	"hfb_sys/backend/internal/database"
 	"hfb_sys/backend/internal/jobs/ordertimeout"
+	"hfb_sys/backend/internal/logging"
 	"hfb_sys/backend/internal/router"
 
 	"go.uber.org/zap"
@@ -18,10 +19,7 @@ import (
 
 func main() {
 	cfg := config.Load()
-	logger, err := zap.NewProduction()
-	if cfg.AppEnv == "development" {
-		logger, err = zap.NewDevelopment()
-	}
+	logger, err := logging.New(cfg.Log)
 	if err != nil {
 		panic(err)
 	}
diff --git a/backend/internal/config/config.go b/backend/internal/config/config.go
index 22afd5a..5fe8086 100644
--- a/backend/internal/config/config.go
+++ b/backend/internal/config/config.go
@@ -15,6 +15,7 @@ type Config struct {
 	JWTSecret     string
 	Storage       StorageConfig
 	SMS           SMSConfig
+	Log           LogConfig
 }
 
 type StorageConfig struct {
@@ -33,6 +34,13 @@ type SMSConfig struct {
 	AliyunLoginTemplateCode string
 }
 
+type LogConfig struct {
+	Level         string
+	Dir           string
+	EnableConsole bool
+	EnableFile    bool
+}
+
 func Load() Config {
 	return Config{
 		AppEnv:        getEnv("APP_ENV", "development"),
@@ -56,6 +64,12 @@ func Load() Config {
 			AliyunSignName:          getEnv("ALIYUN_SMS_SIGN_NAME", ""),
 			AliyunLoginTemplateCode: getEnv("ALIYUN_SMS_LOGIN_TEMPLATE_CODE", ""),
 		},
+		Log: LogConfig{
+			Level:         getEnv("LOG_LEVEL", "info"),
+			Dir:           getEnv("LOG_DIR", "logs"),
+			EnableConsole: getEnvBool("LOG_ENABLE_CONSOLE", true),
+			EnableFile:    getEnvBool("LOG_ENABLE_FILE", true),
+		},
 	}
 }
 
@@ -78,3 +92,15 @@ func getEnvInt(key string, fallback int) int {
 	}
 	return parsed
 }
+
+func getEnvBool(key string, fallback bool) bool {
+	value := os.Getenv(key)
+	if value == "" {
+		return fallback
+	}
+	parsed, err := strconv.ParseBool(value)
+	if err != nil {
+		return fallback
+	}
+	return parsed
+}
diff --git a/backend/internal/logging/daily_writer.go b/backend/internal/logging/daily_writer.go
new file mode 100644
index 0000000..a43f784
--- /dev/null
+++ b/backend/internal/logging/daily_writer.go
@@ -0,0 +1,71 @@
+package logging
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+	"sync"
+	"time"
+)
+
+type dailyWriter struct {
+	mu       sync.Mutex
+	dir      string
+	prefix   string
+	location *time.Location
+	day      string
+	file     *os.File
+}
+
+func newDailyWriter(dir string, prefix string, location *time.Location) *dailyWriter {
+	return &dailyWriter{
+		dir:      dir,
+		prefix:   prefix,
+		location: location,
+	}
+}
+
+func (w *dailyWriter) Write(p []byte) (int, error) {
+	w.mu.Lock()
+	defer w.mu.Unlock()
+
+	if err := w.rotateIfNeeded(time.Now().In(w.location)); err != nil {
+		return 0, err
+	}
+	return w.file.Write(p)
+}
+
+func (w *dailyWriter) Sync() error {
+	w.mu.Lock()
+	defer w.mu.Unlock()
+
+	if w.file == nil {
+		return nil
+	}
+	return w.file.Sync()
+}
+
+func (w *dailyWriter) rotateIfNeeded(now time.Time) error {
+	day := now.Format("2006-01-02")
+	if w.file != nil && w.day == day {
+		return nil
+	}
+
+	if err := os.MkdirAll(w.dir, 0o755); err != nil {
+		return err
+	}
+
+	if w.file != nil {
+		_ = w.file.Close()
+		w.file = nil
+	}
+
+	path := filepath.Join(w.dir, fmt.Sprintf("%s-%s.log", w.prefix, day))
+	file, err := os.OpenFile(path, os.O_CREATE|os.O_APPEND|os.O_WRONLY, 0o644)
+	if err != nil {
+		return err
+	}
+	w.file = file
+	w.day = day
+	return nil
+}
diff --git a/backend/internal/logging/logger.go b/backend/internal/logging/logger.go
new file mode 100644
index 0000000..db113b3
--- /dev/null
+++ b/backend/internal/logging/logger.go
@@ -0,0 +1,75 @@
+package logging
+
+import (
+	"os"
+	"strings"
+	"time"
+
+	"hfb_sys/backend/internal/config"
+
+	"go.uber.org/zap"
+	"go.uber.org/zap/zapcore"
+)
+
+func New(cfg config.LogConfig) (*zap.Logger, error) {
+	location, err := time.LoadLocation("Asia/Shanghai")
+	if err != nil {
+		location = time.FixedZone("Asia/Shanghai", 8*60*60)
+	}
+
+	level := zap.NewAtomicLevelAt(parseLevel(cfg.Level))
+	encoderConfig := zap.NewProductionEncoderConfig()
+	encoderConfig.TimeKey = "time"
+	encoderConfig.LevelKey = "level"
+	encoderConfig.MessageKey = "message"
+	encoderConfig.CallerKey = "caller"
+	encoderConfig.EncodeTime = func(t time.Time, enc zapcore.PrimitiveArrayEncoder) {
+		enc.AppendString(t.In(location).Format("2006-01-02 15:04:05.000 -0700"))
+	}
+	encoderConfig.EncodeLevel = zapcore.CapitalLevelEncoder
+	encoderConfig.EncodeDuration = zapcore.StringDurationEncoder
+	encoderConfig.EncodeCaller = zapcore.ShortCallerEncoder
+
+	cores := make([]zapcore.Core, 0, 2)
+	if cfg.EnableConsole {
+		cores = append(cores, zapcore.NewCore(
+			zapcore.NewConsoleEncoder(encoderConfig),
+			zapcore.Lock(os.Stdout),
+			level,
+		))
+	}
+	if cfg.EnableFile {
+		writer := newDailyWriter(cfg.Dir, "app", location)
+		cores = append(cores, zapcore.NewCore(
+			zapcore.NewConsoleEncoder(encoderConfig),
+			writer,
+			level,
+		))
+	}
+	if len(cores) == 0 {
+		cores = append(cores, zapcore.NewCore(
+			zapcore.NewConsoleEncoder(encoderConfig),
+			zapcore.Lock(os.Stdout),
+			level,
+		))
+	}
+
+	return zap.New(
+		zapcore.NewTee(cores...),
+		zap.AddCaller(),
+		zap.AddStacktrace(zapcore.ErrorLevel),
+	), nil
+}
+
+func parseLevel(value string) zapcore.Level {
+	switch strings.ToLower(strings.TrimSpace(value)) {
+	case "debug":
+		return zapcore.DebugLevel
+	case "warn", "warning":
+		return zapcore.WarnLevel
+	case "error":
+		return zapcore.ErrorLevel
+	default:
+		return zapcore.InfoLevel
+	}
+}