diff --git a/UefiCpuPkg/UefiCpuPkg.dec b/UefiCpuPkg/UefiCpuPkg.dec
index b4e099d43e..3bd8740c98 100644
--- a/UefiCpuPkg/UefiCpuPkg.dec
+++ b/UefiCpuPkg/UefiCpuPkg.dec
@@ -286,7 +286,9 @@
   gUefiCpuPkgTokenSpaceGuid.PcdCpuFeaturesSetting|{0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}|VOID*|0x00000019
 
   ## Contains the size of memory required when CPU processor trace is enabled.<BR><BR>
-  #  Default value is 0x10 which disables the processor trace.<BR>
+  #  Processor trace is enabled through set BIT44(CPU_FEATURE_PROC_TRACE) in PcdCpuFeaturesSetting.<BR><BR>
+  #  This PCD is ignored if CPU processor trace is disabled.<BR><BR>
+  #  Default value is 0x00 which means 4KB of memory is allocated if CPU processor trace is enabled.<BR>
   #  0x0  -  4K.<BR>
   #  0x1  -  8K.<BR>
   #  0x2  -  16K.<BR>
@@ -303,19 +305,19 @@
   #  0xD  -  32M.<BR>
   #  0xE  -  64M.<BR>
   #  0xF  -  128M.<BR>
-  #  0x10 -  ProcTraceMemDisable.<BR>
-  # @Prompt The memory size used for processor trace.
-  # @ValidRange  0x80000001 | 0 - 0x10
-  gUefiCpuPkgTokenSpaceGuid.PcdCpuProcTraceMemSize|0x10|UINT32|0x60000012
+  # @Prompt The memory size used for processor trace if processor trace is enabled.
+  # @ValidRange  0x80000001 | 0 - 0xF
+  gUefiCpuPkgTokenSpaceGuid.PcdCpuProcTraceMemSize|0x0|UINT32|0x60000012
 
   ## Contains the processor trace output scheme when CPU processor trace is enabled.<BR><BR>
-  #  Default value is 2 which disables the processor trace.<BR>
+  #  Processor trace is enabled through set BIT44(CPU_FEATURE_PROC_TRACE) in PcdCpuFeaturesSetting.<BR><BR>
+  #  This PCD is ignored if CPU processor trace is disabled.<BR><BR>
+  #  Default value is 0 which means single range output scheme will be used if CPU processor trace is enabled.<BR>
   #  0 - Single Range output scheme.<BR>
   #  1 - ToPA(Table of physical address) scheme.<BR>
-  #  2 - Invalid scheme.<BR>
-  # @Prompt The processor trace output scheme.
-  # @ValidRange  0x80000001 | 0 - 2
-  gUefiCpuPkgTokenSpaceGuid.PcdCpuProcTraceOutputScheme|0x2|UINT8|0x60000015
+  # @Prompt The processor trace output scheme used when processor trace is enabled.
+  # @ValidRange  0x80000001 | 0 - 1
+  gUefiCpuPkgTokenSpaceGuid.PcdCpuProcTraceOutputScheme|0x0|UINT8|0x60000015
 
 [UserExtensions.TianoCore."ExtraFiles"]
   UefiCpuPkgExtra.uni
diff --git a/UefiCpuPkg/UefiCpuPkg.uni b/UefiCpuPkg/UefiCpuPkg.uni
index 858e4a7235..9472b185e4 100644
--- a/UefiCpuPkg/UefiCpuPkg.uni
+++ b/UefiCpuPkg/UefiCpuPkg.uni
@@ -197,8 +197,10 @@
 
 #string STR_gUefiCpuPkgTokenSpaceGuid_PcdCpuProcTraceMemSize_PROMPT  #language en-US "Memory size used by Processor Trace feature."
 
-#string STR_gUefiCpuPkgTokenSpaceGuid_PcdCpuProcTraceMemSize_HELP  #language en-US "User input the memory size can be used by processor trace feature.<BR><BR>\n"
-                                                                                   "Default value is 0x10 which disables the processor memory trace.<BR>\n"
+#string STR_gUefiCpuPkgTokenSpaceGuid_PcdCpuProcTraceMemSize_HELP  #language en-US "User input the size of memory required when CPU processor trace is enabled.<BR><BR>\n"
+                                                                                   "Processor trace is enabled through set BIT44(CPU_FEATURE_PROC_TRACE) in PcdCpuFeaturesSetting.<BR><BR>\n"
+                                                                                   "This PCD is ignored if CPU processor trace is disabled.<BR><BR>\n"
+                                                                                   "Default value is 0x00 which means 4KB of memory is allocated if CPU processor trace is enabled.<BR>\n"
                                                                                    "0x0  -  4K.<BR>\n"
                                                                                    "0x1  -  8K.<BR>\n"
                                                                                    "0x2  -  16K.<BR>\n"
@@ -215,12 +217,12 @@
                                                                                    "0xD  -  32M.<BR>\n"
                                                                                    "0xE  -  64M.<BR>\n"
                                                                                    "0xF  -  128M.<BR>\n"
-                                                                                   "0x10 -  ProcTraceMemDisable.<BR>\n"
 
 #string STR_gUefiCpuPkgTokenSpaceGuid_PcdCpuProcTraceOutputScheme_PROMPT  #language en-US "Processor Trace output scheme type."
 
-#string STR_gUefiCpuPkgTokenSpaceGuid_PcdCpuProcTraceOutputScheme_HELP  #language en-US "User input the processor trace output scheme type.<BR><BR>\n"
-                                                                                        "Default value is 2 which disables the processor memory trace.<BR>\n"

+#string STR_gUefiCpuPkgTokenSpaceGuid_PcdCpuProcTraceOutputScheme_HELP  #language en-US "User input the processor trace output scheme when CPU processor trace is enabled.<BR><BR>\n"
+                                                                                        "Processor trace is enabled through set BIT44(CPU_FEATURE_PROC_TRACE) in PcdCpuFeaturesSetting.<BR><BR>\n"
+                                                                                        "This PCD is ignored if CPU processor trace is disabled.<BR><BR>\n"
+                                                                                        "Default value is 0 which means single range output scheme will be used if CPU processor trace is enabled.<BR>\n"
                                                                                         "0 - Single Range output scheme.<BR>\n"

-                                                                                        "1 - ToPA(Table of physical address) scheme.<BR>\n"

-                                                                                        "2 - Invalid scheme.<BR>\n"
\ No newline at end of file
+                                                                                        "1 - ToPA(Table of physical address) scheme.<BR>\n"
\ No newline at end of file