diff --git a/VKernel/Kernel/intr/gdt.vp b/VKernel/Kernel/intr/gdt.vp
index 193ff99..2bfade0 100644
--- a/VKernel/Kernel/intr/gdt.vp
+++ b/VKernel/Kernel/intr/gdt.vp
@@ -128,15 +128,14 @@ def setGate(num: int, base: uint64, limit: uint32, access: uint8, gran: uint8):
 
 def setTSS64(num: int, base: uint64, limit: uint32):
     global gdt
-    gdt[num].limit_low   = limit & 0xFFFF
-    gdt[num].base_low    = base & 0xFFFF
-    gdt[num].base_middle = (base >> 16) & 0xFF
-    gdt[num].access      = 0x89
-    gdt[num].granularity = (limit >> 16) & 0x0F
-    gdt[num].base_high   = (base >> 24) & 0xFF
-    gdt[num + 1].limit_low = (base >> 32) & 0xFFFF
-    gdt[num + 1].base_low  = (base >> 48) & 0xFFFF
-    gdt[num + 1].base_middle = 0
-    gdt[num + 1].access = 0
-    gdt[num + 1].granularity = 0
-    gdt[num + 1].base_high = 0
+    # 64 位 TSS 描述符占 16 字节（GDT 两项），复用同一地址按 gdt_entry64 整体写入：
+    # 前 8 字节为常规描述符字段，后 8 字节为 base[63:32] + 保留 0
+    e: gdt_entry64* = gdt_entry64*(&gdt[num])
+    e.limit_low   = limit & 0xFFFF
+    e.base_low    = base & 0xFFFF
+    e.base_middle = (base >> 16) & 0xFF
+    e.access      = 0x89
+    e.granularity = (limit >> 16) & 0x0F
+    e.base_high   = (base >> 24) & 0xFF
+    e.base_upper  = uint32(base >> 32)
+    e.reserved    = 0