diff --git a/src/main/scala/xiangshan/cache/dtlb.scala b/src/main/scala/xiangshan/cache/dtlb.scala
index 8b2fa13a710aafaa7bed16195cb653525089b8bd..52c0f2bb9e99c682116fc8a1e656e514d385ef05 100644
--- a/src/main/scala/xiangshan/cache/dtlb.scala
+++ b/src/main/scala/xiangshan/cache/dtlb.scala
@@ -117,7 +117,7 @@ class TlbEntry extends TlbBundle {
 class TlbEntires(num: Int, tagLen: Int) extends TlbBundle {
   require(log2Up(num)==log2Down(num))
   /* vpn can be divide into three part */
-  // vpn: tagPart + addrPart
+  // vpn: tagPart(17bit) + addrPart(8bit) + cutLenPart(2bit)
   val cutLen  = log2Up(num)
 
   val tag     = UInt(tagLen.W) // NOTE: high part of vpn
@@ -127,9 +127,10 @@ class TlbEntires(num: Int, tagLen: Int) extends TlbBundle {
   val vs      = Vec(num, Bool())
 
   def tagClip(vpn: UInt, level: UInt) = { // full vpn => tagLen
-    Mux(level===0.U, Cat(vpn(vpnLen-1, vpnnLen*2+cutLen), 0.U(vpnnLen*2+cutLen)),
-    Mux(level===1.U, Cat(vpn(vpnLen-1, vpnnLen*1+cutLen), 0.U(vpnnLen*1+cutLen)),
-                     Cat(vpn(vpnLen-1, vpnnLen*0+cutLen), 0.U(vpnnLen*0+cutLen))))(tagLen-1, 0)
+    val tmp = Mux(level===0.U, Cat(vpn(vpnLen-1, vpnnLen*2+cutLen), 0.U(vpnnLen*2)),
+              Mux(level===1.U, Cat(vpn(vpnLen-1, vpnnLen*1+cutLen), 0.U(vpnnLen*1)),
+                               Cat(vpn(vpnLen-1, vpnnLen*0+cutLen), 0.U(vpnnLen*0))))
+    tmp(tmp.getWidth-1, tmp.getWidth-tagLen)
   }
 
   // NOTE: get insize idx
@@ -527,4 +528,4 @@ object TLB {
 
     tlb.io.ptw
   }
-}
\ No newline at end of file
+}