diff --git a/NetworkPkg/NetworkPkg.dec b/NetworkPkg/NetworkPkg.dec
index aae36226d5..6672d90fe1 100644
--- a/NetworkPkg/NetworkPkg.dec
+++ b/NetworkPkg/NetworkPkg.dec
@@ -92,6 +92,12 @@
   # @Prompt Indicates whether HTTP connections are permitted or not.
   gEfiNetworkPkgTokenSpaceGuid.PcdAllowHttpConnections|FALSE|BOOLEAN|0x00000008
 
+  ## This setting is to specify the MTFTP windowsize used by UEFI PXE driver.
+  # A value of 0 indicates the default value of windowsize(1).
+  # A non-zero value will be used as windowsize.
+  # @Prompt PXE TFTP windowsize.
+  gEfiNetworkPkgTokenSpaceGuid.PcdPxeTftpWindowSize|0x4|UINT64|0x10000008
+
 [PcdsFixedAtBuild, PcdsPatchableInModule, PcdsDynamic, PcdsDynamicEx]
   ## IPv6 DHCP Unique Identifier (DUID) Type configuration (From RFCs 3315 and 6355).
   # 01 = DUID Based on Link-layer Address Plus Time [DUID-LLT]
diff --git a/NetworkPkg/NetworkPkg.uni b/NetworkPkg/NetworkPkg.uni
index 5604b1bf32..3c7d40b2cb 100644
--- a/NetworkPkg/NetworkPkg.uni
+++ b/NetworkPkg/NetworkPkg.uni
@@ -55,6 +55,12 @@
                                                                                        "TRUE  - HTTP connections are allowed.\n"
                                                                                        "FALSE - HTTP connections are denied."
 
+#string STR_gEfiNetworkPkgTokenSpaceGuid_PcdPxeTftpWindowSize_PROMPT  #language en-US "This setting is to specify the MTFTP windowsize used by UEFI PXE driver."
+
+#string STR_gEfiNetworkPkgTokenSpaceGuid_PcdPxeTftpWindowSize_HELP  #language en-US "Specify MTFTP windowsize used by UEFI PXE driver.\n"
+                                                                                    "A value of 0 indicates the default value of windowsize(1).\n"
+                                                                                    "A non-zero value will be used as windowsize."
+
 #string STR_gEfiNetworkPkgTokenSpaceGuid_PcdIpsecCertificateEnabled_PROMPT  #language en-US "Enable IPsec IKEv2 Certificate Authentication."
 
 #string STR_gEfiNetworkPkgTokenSpaceGuid_PcdIpsecCertificateEnabled_HELP  #language en-US "Indicates if the IPsec IKEv2 Certificate Authentication feature is enabled or not.<BR><BR>\n"