diff --git a/UefiCpuPkg/UefiCpuPkg.dec b/UefiCpuPkg/UefiCpuPkg.dec
index 0d42918427..472b38acbc 100644
--- a/UefiCpuPkg/UefiCpuPkg.dec
+++ b/UefiCpuPkg/UefiCpuPkg.dec
@@ -190,6 +190,11 @@
   # @Prompt The AP wait loop state.
   # @ValidRange  0x80000001 | 1 - 3
   gUefiCpuPkgTokenSpaceGuid.PcdCpuApLoopMode|1|UINT8|0x60008006
+  ## Specifies the AP target C-state for Mwait during POST phase.
+  #  The default value 0 means C1 state.
+  #  The value is defined as below.<BR><BR>
+  # @Prompt The specified AP target C-state for Mwait.
+  gUefiCpuPkgTokenSpaceGuid.PcdCpuApTargetCstate|0|UINT8|0x00000007
 
 [PcdsDynamic, PcdsDynamicEx]
   ## Contains the pointer to a CPU S3 data buffer of structure ACPI_CPU_DATA.
diff --git a/UefiCpuPkg/UefiCpuPkg.uni b/UefiCpuPkg/UefiCpuPkg.uni
index 2c74a92e06..13f0e41aeb 100644
--- a/UefiCpuPkg/UefiCpuPkg.uni
+++ b/UefiCpuPkg/UefiCpuPkg.uni
@@ -143,3 +143,7 @@
 
 #string STR_gUefiCpuPkgTokenSpaceGuid_PcdCpuApLoopMode_HELP  #language en-US "Specifies the AP wait loop state during POST phase."
 
+#string STR_gUefiCpuPkgTokenSpaceGuid_PcdCpuApTargetCstate_PROMPT  #language en-US "The specified AP target C-state for Mwait"
+
+#string STR_gUefiCpuPkgTokenSpaceGuid_PcdCpuApTargetCstate_HELP  #language en-US "Specifies the AP target C-state for Mwait during POST phase."
+