diff --git a/internal/resolver/cache.go b/internal/resolver/cache.go
index 9772003..04135c3 100644
--- a/internal/resolver/cache.go
+++ b/internal/resolver/cache.go
@@ -27,9 +27,9 @@ func (r *DNSResolver) GetCacheStats() CacheStats {
 	// 统计缓存条目
 	var entries, expired int
 	now := time.Now()
-	r.cache.Range(func(key, value interface{}) bool {
+	r.cache.Range(func(_ interface{}, value interface{}) bool {
 		entries++
-		entry := value.(*dnsCacheEntry)
+		entry := value.(*DNSCacheEntry)
 		entry.mu.RLock()
 		if now.After(entry.ExpiresAt) {
 			expired++
@@ -47,9 +47,9 @@ func (r *DNSResolver) GetCacheStats() CacheStats {
 }
 
 // GetCacheEntry 获取指定主机的缓存条目（用于测试）。
-func (r *DNSResolver) GetCacheEntry(host string) (*dnsCacheEntry, bool) {
+func (r *DNSResolver) GetCacheEntry(host string) (*DNSCacheEntry, bool) {
 	if entry, ok := r.cache.Load(host); ok {
-		return entry.(*dnsCacheEntry), true
+		return entry.(*DNSCacheEntry), true
 	}
 	return nil, false
 }
@@ -84,7 +84,7 @@ func (r *DNSResolver) GetHitRate() float64 {
 // IsCached 检查指定主机是否在缓存中且未过期。
 func (r *DNSResolver) IsCached(host string) bool {
 	if entry, ok := r.cache.Load(host); ok {
-		cacheEntry := entry.(*dnsCacheEntry)
+		cacheEntry := entry.(*DNSCacheEntry)
 		cacheEntry.mu.RLock()
 		expiresAt := cacheEntry.ExpiresAt
 		cacheEntry.mu.RUnlock()
diff --git a/internal/resolver/resolver.go b/internal/resolver/resolver.go
index 92caa14..015f03b 100644
--- a/internal/resolver/resolver.go
+++ b/internal/resolver/resolver.go
@@ -44,11 +44,11 @@ type Resolver interface {
 	Stop() error
 
 	// Stats 返回统计信息
-	Stats() ResolverStats
+	Stats() Stats
 }
 
-// ResolverStats 解析器统计信息。
-type ResolverStats struct {
+// Stats 解析器统计信息。
+type Stats struct {
 	CacheHits      int64         // 缓存命中次数
 	CacheMisses    int64         // 缓存未命中次数
 	CacheEntries   int           // 当前缓存条目数
@@ -59,7 +59,7 @@ type ResolverStats struct {
 // DNSResolver 实现 Resolver 接口的 DNS 解析器。
 type DNSResolver struct {
 	config    *config.ResolverConfig
-	cache     sync.Map // key: hostname, value: *dnsCacheEntry
+	cache     sync.Map // key: hostname, value: *DNSCacheEntry
 	serverIdx atomic.Uint32
 
 	// 统计信息
@@ -76,8 +76,8 @@ type DNSResolver struct {
 	refreshHosts map[string]struct{} // 需要刷新的主机列表
 }
 
-// dnsCacheEntry DNS 缓存条目。
-type dnsCacheEntry struct {
+// DNSCacheEntry DNS 缓存条目。
+type DNSCacheEntry struct {
 	IPs        []string
 	ExpiresAt  time.Time
 	LastLookup time.Time
@@ -136,7 +136,7 @@ func (r *DNSResolver) lookup(ctx context.Context, host string, useCache bool) ([
 	// 尝试从缓存获取
 	if useCache {
 		if entry, ok := r.cache.Load(host); ok {
-			cacheEntry := entry.(*dnsCacheEntry)
+			cacheEntry := entry.(*DNSCacheEntry)
 			cacheEntry.mu.RLock()
 			ips := cacheEntry.IPs
 			expiresAt := cacheEntry.ExpiresAt
@@ -169,7 +169,7 @@ func (r *DNSResolver) lookup(ctx context.Context, host string, useCache bool) ([
 	}
 
 	// 更新缓存
-	entry := &dnsCacheEntry{
+	entry := &DNSCacheEntry{
 		IPs:        ips,
 		ExpiresAt:  time.Now().Add(r.config.TTL()),
 		LastLookup: time.Now(),
@@ -218,7 +218,7 @@ func (r *DNSResolver) queryWithResolver(ctx context.Context, host, server string
 	if server != "" {
 		resolver = &net.Resolver{
 			PreferGo: true,
-			Dial: func(ctx context.Context, network, address string) (net.Conn, error) {
+			Dial: func(ctx context.Context, _, _ string) (net.Conn, error) {
 				d := net.Dialer{}
 				return d.DialContext(ctx, "udp", server)
 			},
@@ -362,13 +362,13 @@ func (r *DNSResolver) Stop() error {
 }
 
 // Stats 返回统计信息。
-func (r *DNSResolver) Stats() ResolverStats {
+func (r *DNSResolver) Stats() Stats {
 	hits := r.hits.Load()
 	misses := r.misses.Load()
 
 	// 统计缓存条目数
 	var entries int
-	r.cache.Range(func(key, value interface{}) bool {
+	r.cache.Range(func(_, _ interface{}) bool {
 		entries++
 		return true
 	})
@@ -380,7 +380,7 @@ func (r *DNSResolver) Stats() ResolverStats {
 		avgLatency = time.Duration(r.latencyNs.Load() / count)
 	}
 
-	return ResolverStats{
+	return Stats{
 		CacheHits:      hits,
 		CacheMisses:    misses,
 		CacheEntries:   entries,
@@ -392,7 +392,7 @@ func (r *DNSResolver) Stats() ResolverStats {
 // noopResolver 是禁用状态下的空实现。
 type noopResolver struct{}
 
-func (n *noopResolver) LookupHost(ctx context.Context, host string) ([]string, error) {
+func (n *noopResolver) LookupHost(_ context.Context, _ string) ([]string, error) {
 	return nil, fmt.Errorf("resolver is disabled")
 }
 
@@ -400,7 +400,7 @@ func (n *noopResolver) LookupHostWithCache(ctx context.Context, host string) ([]
 	return n.LookupHost(ctx, host)
 }
 
-func (n *noopResolver) Refresh(host string) error {
+func (n *noopResolver) Refresh(_ string) error {
 	return nil
 }
 
@@ -412,6 +412,6 @@ func (n *noopResolver) Stop() error {
 	return nil
 }
 
-func (n *noopResolver) Stats() ResolverStats {
-	return ResolverStats{}
+func (n *noopResolver) Stats() Stats {
+	return Stats{}
 }
diff --git a/internal/resolver/resolver_test.go b/internal/resolver/resolver_test.go
index c45bd2d..a7f5778 100644
--- a/internal/resolver/resolver_test.go
+++ b/internal/resolver/resolver_test.go
@@ -108,7 +108,7 @@ func TestCache(t *testing.T) {
 	r := New(cfg).(*DNSResolver)
 
 	// 模拟缓存条目
-	r.cache.Store("test.example.com", &dnsCacheEntry{
+	r.cache.Store("test.example.com", &DNSCacheEntry{
 		IPs:       []string{"192.168.1.1", "192.168.1.2"},
 		ExpiresAt: time.Now().Add(1 * time.Minute),
 	})
@@ -133,7 +133,7 @@ func TestCache(t *testing.T) {
 
 	// 测试缓存过期
 	// 更新缓存条目为过期
-	r.cache.Store("test.example.com", &dnsCacheEntry{
+	r.cache.Store("test.example.com", &DNSCacheEntry{
 		IPs:       []string{"192.168.1.1"},
 		ExpiresAt: time.Now().Add(-1 * time.Second), // 已过期
 	})
@@ -157,13 +157,13 @@ func TestIsCached(t *testing.T) {
 	r := New(cfg).(*DNSResolver)
 
 	// 添加未过期的缓存
-	r.cache.Store("active.example.com", &dnsCacheEntry{
+	r.cache.Store("active.example.com", &DNSCacheEntry{
 		IPs:       []string{"192.168.1.1"},
 		ExpiresAt: time.Now().Add(1 * time.Minute),
 	})
 
 	// 添加已过期的缓存
-	r.cache.Store("expired.example.com", &dnsCacheEntry{
+	r.cache.Store("expired.example.com", &DNSCacheEntry{
 		IPs:       []string{"192.168.1.2"},
 		ExpiresAt: time.Now().Add(-1 * time.Second),
 	})
@@ -194,7 +194,7 @@ func TestCacheHitRate(t *testing.T) {
 	}
 
 	// 模拟缓存命中
-	r.cache.Store("test.example.com", &dnsCacheEntry{
+	r.cache.Store("test.example.com", &DNSCacheEntry{
 		IPs:       []string{"192.168.1.1"},
 		ExpiresAt: time.Now().Add(1 * time.Minute),
 	})
@@ -227,11 +227,11 @@ func TestStats(t *testing.T) {
 	r := New(cfg).(*DNSResolver)
 
 	// 添加缓存条目
-	r.cache.Store("test1.example.com", &dnsCacheEntry{
+	r.cache.Store("test1.example.com", &DNSCacheEntry{
 		IPs:       []string{"192.168.1.1"},
 		ExpiresAt: time.Now().Add(1 * time.Minute),
 	})
-	r.cache.Store("test2.example.com", &dnsCacheEntry{
+	r.cache.Store("test2.example.com", &DNSCacheEntry{
 		IPs:       []string{"192.168.1.2"},
 		ExpiresAt: time.Now().Add(1 * time.Minute),
 	})
@@ -329,7 +329,7 @@ func TestDeleteCacheEntry(t *testing.T) {
 	r := New(cfg).(*DNSResolver)
 
 	// 添加缓存
-	r.cache.Store("test.example.com", &dnsCacheEntry{
+	r.cache.Store("test.example.com", &DNSCacheEntry{
 		IPs:       []string{"192.168.1.1"},
 		ExpiresAt: time.Now().Add(1 * time.Minute),
 	})
@@ -358,7 +358,7 @@ func TestClearCache(t *testing.T) {
 	// 添加多个缓存
 	for i := 0; i < 5; i++ {
 		host := fmt.Sprintf("test%d.example.com", i)
-		r.cache.Store(host, &dnsCacheEntry{
+		r.cache.Store(host, &DNSCacheEntry{
 			IPs:       []string{fmt.Sprintf("192.168.1.%d", i)},
 			ExpiresAt: time.Now().Add(1 * time.Minute),
 		})
@@ -387,7 +387,7 @@ func TestConcurrentAccess(t *testing.T) {
 	r := New(cfg).(*DNSResolver)
 
 	// 添加测试缓存
-	r.cache.Store("test.example.com", &dnsCacheEntry{
+	r.cache.Store("test.example.com", &DNSCacheEntry{
 		IPs:       []string{"192.168.1.1"},
 		ExpiresAt: time.Now().Add(1 * time.Minute),
 	})
@@ -533,13 +533,13 @@ func TestCacheStats(t *testing.T) {
 	r := New(cfg).(*DNSResolver)
 
 	// 添加活跃缓存
-	r.cache.Store("active.example.com", &dnsCacheEntry{
+	r.cache.Store("active.example.com", &DNSCacheEntry{
 		IPs:       []string{"192.168.1.1"},
 		ExpiresAt: time.Now().Add(1 * time.Minute),
 	})
 
 	// 添加过期缓存
-	r.cache.Store("expired.example.com", &dnsCacheEntry{
+	r.cache.Store("expired.example.com", &DNSCacheEntry{
 		IPs:       []string{"192.168.1.2"},
 		ExpiresAt: time.Now().Add(-1 * time.Second),
 	})
diff --git a/internal/resolver/stats.go b/internal/resolver/stats.go
index c8ff886..b5d82a9 100644
--- a/internal/resolver/stats.go
+++ b/internal/resolver/stats.go
@@ -20,7 +20,7 @@ type StatsCollector interface {
 	// RecordLatency 记录解析延迟
 	RecordLatency(latency time.Duration)
 	// GetStats 获取当前统计
-	GetStats() ResolverStats
+	GetStats() Stats
 }
 
 // ResetStats 重置所有统计信息。