diff --git a/internal/ttlcache/cache.go b/internal/ttlcache/cache.go
index c71dc6f..3b5b05b 100644
--- a/internal/ttlcache/cache.go
+++ b/internal/ttlcache/cache.go
@@ -5,7 +5,7 @@ import (
 	"github.com/TeaOSLab/EdgeNode/internal/utils/fasttime"
 )
 
-var SharedCache = NewCache()
+var SharedCache = NewBigCache()
 
 // Cache TTL缓存
 // 最大的缓存时间为30 * 86400
@@ -25,6 +25,14 @@ type Cache struct {
 	gcPieceIndex int
 }
 
+func NewBigCache() *Cache {
+	var delta = utils.SystemMemoryGB() / 2
+	if delta <= 0 {
+		delta = 1
+	}
+	return NewCache(NewMaxItemsOption(delta * 1_000_000))
+}
+
 func NewCache(opt ...OptionInterface) *Cache {
 	var countPieces = 256
 	var maxItems = 1_000_000
@@ -34,7 +42,7 @@ func NewCache(opt ...OptionInterface) *Cache {
 		// 我们限制内存过小的服务能够使用的数量
 		maxItems = 500_000
 	} else {
-		var delta = totalMemory / 8
+		var delta = totalMemory / 4
 		if delta > 0 {
 			maxItems *= delta
 		}
diff --git a/internal/utils/system.go b/internal/utils/system.go
index 031d4fa..aec07e5 100644
--- a/internal/utils/system.go
+++ b/internal/utils/system.go
@@ -17,6 +17,8 @@ func init() {
 	_ = SystemMemoryGB()
 }
 
+// SystemMemoryGB 系统内存GB数量
+// 必须保证不小于1
 func SystemMemoryGB() int {
 	if systemTotalMemory > 0 {
 		return systemTotalMemory
@@ -24,10 +26,10 @@ func SystemMemoryGB() int {
 
 	stat, err := mem.VirtualMemory()
 	if err != nil {
-		return 0
+		return 1
 	}
 
-	systemTotalMemory = int(stat.Total / 1024 / 1024 / 1024)
+	systemTotalMemory = int(stat.Total / (1<<30))
 	if systemTotalMemory <= 0 {
 		systemTotalMemory = 1
 	}