diff --git a/BaseTools/Source/Python/AutoGen/AutoGen.py b/BaseTools/Source/Python/AutoGen/AutoGen.py
index 289309fff0..c5ab334459 100644
--- a/BaseTools/Source/Python/AutoGen/AutoGen.py
+++ b/BaseTools/Source/Python/AutoGen/AutoGen.py
@@ -16,19 +16,20 @@
 ## Import Modules
 #
 from __future__ import print_function
+from __future__ import absolute_import
 import Common.LongFilePathOs as os
 import re
 import os.path as path
 import copy
 import uuid
 
-import GenC
-import GenMake
-import GenDepex
+from . import GenC
+from . import GenMake
+from . import GenDepex
 from io import BytesIO
 
-from StrGather import *
-from BuildEngine import BuildRule
+from .StrGather import *
+from .BuildEngine import BuildRule
 
 from Common.LongFilePathSupport import CopyLongFilePath
 from Common.BuildToolError import *
@@ -41,14 +42,14 @@ from CommonDataClass.CommonClass import SkuInfoClass
 from Workspace.BuildClassObject import *
 from GenPatchPcdTable.GenPatchPcdTable import parsePcdInfoFromMapFile
 import Common.VpdInfoFile as VpdInfoFile
-from GenPcdDb import CreatePcdDatabaseCode
+from .GenPcdDb import CreatePcdDatabaseCode
 from Workspace.MetaFileCommentParser import UsageList
 from Workspace.WorkspaceCommon import GetModuleLibInstances
 from Common.MultipleWorkspace import MultipleWorkspace as mws
-import InfSectionParser
+from . import InfSectionParser
 import datetime
 import hashlib
-from GenVar import VariableMgr, var_info
+from .GenVar import VariableMgr, var_info
 from collections import OrderedDict
 from collections import defaultdict
 from Workspace.WorkspaceCommon import OrderedListDict
diff --git a/BaseTools/Source/Python/AutoGen/GenC.py b/BaseTools/Source/Python/AutoGen/GenC.py
index 2dca9ffd5b..3b396491d0 100644
--- a/BaseTools/Source/Python/AutoGen/GenC.py
+++ b/BaseTools/Source/Python/AutoGen/GenC.py
@@ -13,6 +13,7 @@
 
 ## Import Modules
 #
+from __future__ import absolute_import
 import string
 import collections
 import struct
@@ -22,9 +23,9 @@ from Common.BuildToolError import *
 from Common.DataType import *
 from Common.Misc import *
 from Common.StringUtils import StringToArray
-from StrGather import *
-from GenPcdDb import CreatePcdDatabaseCode
-from IdfClassObject import *
+from .StrGather import *
+from .GenPcdDb import CreatePcdDatabaseCode
+from .IdfClassObject import *
 
 ## PCD type string
 gItemTypeStringDatabase  = {
diff --git a/BaseTools/Source/Python/AutoGen/GenMake.py b/BaseTools/Source/Python/AutoGen/GenMake.py
index 992de5490d..f1dc147541 100644
--- a/BaseTools/Source/Python/AutoGen/GenMake.py
+++ b/BaseTools/Source/Python/AutoGen/GenMake.py
@@ -13,6 +13,7 @@
 
 ## Import Modules
 #
+from __future__ import absolute_import
 import Common.LongFilePathOs as os
 import sys
 import string
@@ -23,7 +24,7 @@ from Common.MultipleWorkspace import MultipleWorkspace as mws
 from Common.BuildToolError import *
 from Common.Misc import *
 from Common.StringUtils import *
-from BuildEngine import *
+from .BuildEngine import *
 import Common.GlobalData as GlobalData
 from collections import OrderedDict
 
diff --git a/BaseTools/Source/Python/AutoGen/GenPcdDb.py b/BaseTools/Source/Python/AutoGen/GenPcdDb.py
index c90b814e7d..2176bbefeb 100644
--- a/BaseTools/Source/Python/AutoGen/GenPcdDb.py
+++ b/BaseTools/Source/Python/AutoGen/GenPcdDb.py
@@ -10,13 +10,14 @@
 # THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
 # WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
 #
+from __future__ import absolute_import
 from io import BytesIO
 from Common.Misc import *
 from Common.StringUtils import StringToArray
 from struct import pack
-from ValidCheckingInfoObject import VAR_CHECK_PCD_VARIABLE_TAB_CONTAINER
-from ValidCheckingInfoObject import VAR_CHECK_PCD_VARIABLE_TAB
-from ValidCheckingInfoObject import GetValidationObject
+from .ValidCheckingInfoObject import VAR_CHECK_PCD_VARIABLE_TAB_CONTAINER
+from .ValidCheckingInfoObject import VAR_CHECK_PCD_VARIABLE_TAB
+from .ValidCheckingInfoObject import GetValidationObject
 from Common.VariableAttributes import VariableAttributes
 import copy
 from struct import unpack
diff --git a/BaseTools/Source/Python/AutoGen/IdfClassObject.py b/BaseTools/Source/Python/AutoGen/IdfClassObject.py
index b656bd83e3..b227b10258 100644
--- a/BaseTools/Source/Python/AutoGen/IdfClassObject.py
+++ b/BaseTools/Source/Python/AutoGen/IdfClassObject.py
@@ -13,6 +13,7 @@
 ##
 # Import Modules
 #
+from __future__ import absolute_import
 import Common.EdkLogger as EdkLogger
 from Common.BuildToolError import *
 from Common.StringUtils import GetLineNo
@@ -21,7 +22,7 @@ from Common.LongFilePathSupport import LongFilePath
 import re
 import os
 from Common.GlobalData import gIdentifierPattern
-from UniClassObject import StripComments
+from .UniClassObject import StripComments
 
 IMAGE_TOKEN = re.compile('IMAGE_TOKEN *\(([A-Z0-9_]+) *\)', re.MULTILINE | re.UNICODE)
 
diff --git a/BaseTools/Source/Python/AutoGen/StrGather.py b/BaseTools/Source/Python/AutoGen/StrGather.py
index a702ef0dd5..361d499076 100644
--- a/BaseTools/Source/Python/AutoGen/StrGather.py
+++ b/BaseTools/Source/Python/AutoGen/StrGather.py
@@ -14,10 +14,11 @@
 ##
 # Import Modules
 #
+from __future__ import absolute_import
 import re
 import Common.EdkLogger as EdkLogger
 from Common.BuildToolError import *
-from UniClassObject import *
+from .UniClassObject import *
 from io import BytesIO
 from struct import pack, unpack
 from Common.LongFilePathSupport import OpenLongFilePath as open