通过相应路径找到Colors.xml文件把以下代码断覆盖：
XP系统下：
C:documents and SettingsAdministratorApplicationDataAdobeDreamweaver CS4zh_CNConfigurationCodeColoring
Win7系统下
C:用户AdministratorAppDataRoamingAdobeDreamweaverCS5en_USConfigurationCodeColoring
覆盖完成以后，发现背景并没有改变，
覆盖后还要执行：编辑->首选项参数（Ctrl+U） -> 代码颜色-> html默认背景色改为：#3f3f3f，如果不合自己心意也可以在配色方案中进行更改。
(配色方案在下方预览窗口中直接点击寻找代码更改颜色)。
代码如下:
<codeColors>
<colorGroup>
<syntaxColor id="CodeColor_HTMLEntity" bold="true" />
<syntaxColor id="CodeColor_JavascriptNative" text="#009999" />
<syntaxColor id="CodeColor_JavascriptNumber" text="#FF0000" />
<syntaxColor id="CodeColor_JavascriptClient" text="#990099" />
<syntaxColor id="CodeColor_JavascriptSpryKeywords" text="#FF6208" />
<syntaxColor id="CodeColor_JavascriptSpryClasses" text="#FF6208" />
<syntaxColor id="CodeColor_TemplateText" text="#999999" />
<syntaxColor id="CodeColor_TemplateCommentText" text="#006600" />
<syntaxColor id="CodeColor_TemplateCommentAttr" text="#006600" />
<syntaxColor id="CodeColor_CFCommentText" text="#000000" bgcolor="#FFFF99" />
<syntaxColor id="CodeColor_JavaJSP" text="#009999" />
<syntaxColor id="CodeColor_JavaImplicit" text="#999900" />
<syntaxColor id="CodeColor_JavaOther" text="#990099" />
<syntaxColor id="CodeColor_JSPPageOperator" text="#000000" />
<syntaxColor id="CodeColor_JSPTaglibOperator" text="#000000" />
<syntaxColor id="CodeColor_JSPIncludeOperator" text="#000000" />
<syntaxColor id="CodeColor_PHPscriptBlock" text="#FF0000" bold="true" />
<syntaxColor id="CodeColor_PHPscriptComment" text="#FF9900" />
<syntaxColor id="CodeColor_PHPscriptConstant" text="#552200" />
<syntaxColor id="CodeColor_PHPscriptString" text="#CC0000" />
<syntaxColor id="CodeColor_PHPscriptFunctionsKeywords" text="#0000FF" />
<syntaxColor id="CodeColor_PHPscriptReserved" text="#006600" />
<syntaxColor id="CodeColor_PHPscriptTypes" text="#009999" />
<syntaxColor id="CodeColor_PHPscriptVariables" text="#0066FF" />
<syntaxColor id="CodeColor_ASPIncludeAttributes" text="#990099" />
<syntaxColor id="CodeColor_ASPDirOperator" text="#000000" />
<syntaxColor id="CodeColor_LibraryText" bgcolor="#FFFFCC" />
<syntaxColor id="CodeColor_DateText" bgcolor="#FFFFCC" />
<syntaxColor id="CodeColor_ASPJSNative" text="#009999" />
<syntaxColor id="CodeColor_ASPJSKeywords" text="#990099" />
<syntaxColor id="CodeColor_ASPNetCSharpKeywords" text="#990099" />
<syntaxColor id="CodeColor_VBSNative" text="#990099" />
<syntaxColor id="CodeColor_VBSConstants" text="#009999" />
<syntaxColor id="CodeColor_VBNetNative" text="#990099" />
<syntaxColor id="CodeColor_VBNetConstants" text="#009999" />
<tagColor id="CodeColor_HTMLAnchor" text="#006600" />
<tagColor id="CodeColor_HTMLForm" text="#FF9900" />
<tagColor id="CodeColor_HTMLImage" text="#990099" />
<tagColor id="CodeColor_HTMLObject" text="#990000" />
<tagColor id="CodeColor_HTMLscript" text="#990000" />
<tagColor id="CodeColor_HTMLStyle" text="#990099" />
<tagColor id="CodeColor_HTMLTable" text="#009999" />
<syntaxColor id="CodeColor_SpryAttributes" text="#FF6208" />
<syntaxColor id="CodeColor_Spry_Tag_Normal" bgcolor="#F8D0AF" />
<syntaxColor id="CodeColor_Spry_Tag_Hover" bgcolor="#FF9B58" />
<syntaxColor id="CodeColor_Spry_Tag_Selected" bgcolor="#FF6D0C" />
<syntaxColor id="CodeColor_HTMLComment" text="#999999" />
<syntaxColor id="CodeColor_HTMLString" text="#0000FF" />
<syntaxColor id="CodeColor_HTMLNumber" text="#0000FF" />
<syntaxColor id="CodeColor_JavascriptFunction" text="#000000" bold="true" />
<syntaxColor id="CodeColor_JavascriptBracket" text="#000099" bold="true" />
<syntaxColor id="CodeColor_JavascriptReserved" text="#000099" bold="true" />
<syntaxColor id="CodeColor_JavascriptString" text="#0000FF" />
<syntaxColor id="CodeColor_JavascriptComment" text="#999999" />
<syntaxColor id="CodeColor_CSSSelector" text="#FF00FF" />
<syntaxColor id="CodeColor_CSSProperty" text="#000099" />
<syntaxColor id="CodeColor_CSSValue" text="#0000FF" />
<syntaxColor id="CodeColor_CSSimport" text="#009999" bold="true" />
<syntaxColor id="CodeColor_CSSMedia" text="#990000" bold="true" />
<syntaxColor id="CodeColor_CssKeywordimportant" text="#FF0000" bold="true" />
<tagColor id="DWTagLibrary_cfc" text="#990033" />
<tagColor id="DWTagLibrary_cfml" text="#990033" />
<syntaxColor id="CodeColor_ASPDirTagKeywords" text="#990033" />
<tagColor id="DWTagLibrary_aspnetmmtags" text="#990033" />
<tagColor id="DWTagLibrary_aspnettemplates" text="#990033" />
<tagColor id="DWTagLibrary_aspnet" text="#990033" />
<tagColor id="CodeColor_CFscriptTag" text="#990033" />
<syntaxColor id="CodeColor_ASPDirString" text="#0000FF" />
<syntaxColor id="CodeColor_ActionscriptProperty" text="#000084" />
<syntaxColor id="CodeColor_ActionscriptNative" text="#000084" />
<syntaxColor id="CodeColor_ActionscriptNumber" text="#000000" />
<syntaxColor id="CodeColor_ActionscriptFunction" text="#000084" />
<syntaxColor id="CodeColor_ActionscriptBracket" text="#000000" />
<syntaxColor id="CodeColor_ActionscriptOperator" text="#000000" />
<syntaxColor id="CodeColor_ActionscriptReserved" text="#000084" />
<syntaxColor id="CodeColor_ActionscriptString" text="#0000FF" />
<syntaxColor id="CodeColor_ActionscriptComment" text="#848284" />
<syntaxColor id="CodeColor_ActionscriptRemoting" text="#000084" />
<syntaxColor id="CodeColor_ASCommBracket" text="#000099" bold="true" />
<syntaxColor id="CodeColor_ASCommComment" text="#999999" />
<syntaxColor id="CodeColor_ASCommFunction" text="#000000" bold="true" />
<syntaxColor id="CodeColor_ASCommNative" text="#009999" />
<syntaxColor id="CodeColor_ASCommNumber" text="#FF0000" />
<syntaxColor id="CodeColor_ASCommReserved" text="#000099" />
<syntaxColor id="CodeColor_ASCommString" text="#0000FF" />
<syntaxColor id="CodeColor_ASRemoteBracket" text="#000099" bold="true" />
<syntaxColor id="CodeColor_ASRemoteComment" text="#999999" />
<syntaxColor id="CodeColor_ASRemoteFunction" text="#000000" bold="true" />
<syntaxColor id="CodeColor_ASRemoteNative" text="#009999" />
<syntaxColor id="CodeColor_ASRemoteNumber" text="#FF0000" />
<syntaxColor id="CodeColor_ASRemoteReserved" text="#000099" />
<syntaxColor id="CodeColor_ASRemoteString" text="#0000FF" />
</colorGroup>
<colorGroup doctypes="CSS">
<syntaxColor id="CodeColor_CSSimport" text="#666" bold="true" />
<syntaxColor id="CodeColor_CSSMedia" text="#900" bold="true" />
<syntaxColor id="CodeColor_CssKeywordimportant" text="#F00" bold="true" />
<syntaxColor id="CodeColor_CSSSelector" text="#7CB7F1" />
<syntaxColor id="CodeColor_CSSValue" text="#F0EB8E" />
<syntaxColor id="CodeColor_CSSProperty" text="#8FE28F" />
<syntaxColor id="CodeColor_CSSComment" text="#CCC" />
<syntaxColor id="CodeColor_CSSString" text="#FF0" />
</colorGroup>
<colorGroup doctypes="HTML">
<syntaxColor id="CodeColor_AspIncludeDirDefaultText" text="#000" />
<syntaxColor id="CodeColor_ASPIncludeAttributes" text="#909" />
<syntaxColor id="CodeColor_ASPIncludeString" text="#060" />
<tagColor id="CodeColor_CFscriptTag" text="#903" />
<syntaxColor id="CodeColor_CSSimport" text="#666" bold="true" />
<syntaxColor id="CodeColor_CSSMedia" text="#CC0" />
<syntaxColor id="CodeColor_CssKeywordimportant" text="#FF0" />
<syntaxColor id="CodeColor_CSSSelector" text="#8fe28f" />
<syntaxColor id="CodeColor_CSSValue" text="#B44781" />
<syntaxColor id="CodeColor_CSSProperty" text="#7E9F74" />
<syntaxColor id="CodeColor_CSSComment" text="#BBB" />
<syntaxColor id="CodeColor_CSSString" text="#DB0057" />
<tagColor id="CodeColor_HTMLAnchor" text="#6DB7F1" />
<tagColor id="CodeColor_HTMLForm" text="#F90" />
<tagColor id="CodeColor_HTMLImage" text="#B44781" />
<tagColor id="CodeColor_HTMLObject" text="#900" />
<tagColor id="CodeColor_HTMLscript" text="#FF0" />
<tagColor id="CodeColor_HTMLStyle" text="#FF0" />
<tagColor id="CodeColor_HTMLTable" text="#62B773" />
<tagColor id="DWTagLibrary_html" text="#8fe27b" />
<syntaxColor id="CodeColor_HTMLTag" text="#BBB" />
<syntaxColor id="CodeColor_HTMLNumber" text="#FFF" />
<syntaxColor id="CodeColor_HTMLEntity" text="#666" bold="true" />
<syntaxColor id="CodeColor_HTMLText" text="#C3D3D7" />
<syntaxColor id="CodeColor_HTMLString" text="#f0eb8e" />
<syntaxColor id="CodeColor_HTMLComment" text="#BBB" />
<syntaxColor id="CodeColor_JavascriptRegexp" text="#060" />
<syntaxColor id="CodeColor_JavascriptReserved" text="#CC0" bold="true" />
<syntaxColor id="CodeColor_JavascriptNative" text="#099" />
<syntaxColor id="CodeColor_JavascriptIdentifier" text="#9C0" />
<syntaxColor id="CodeColor_JavascriptFunction" text="#FFF" bold="true" />
<syntaxColor id="CodeColor_JavascriptClient" text="#9C0" />
<syntaxColor id="CodeColor_JavascriptBracket" text="#FFF" bold="true" />
<syntaxColor id="CodeColor_JavascriptDefaultText" text="#FFF" />
<syntaxColor id="CodeColor_JavascriptNumber" text="#B44781" />
<syntaxColor id="CodeColor_JavascriptOperator" text="#CC0" />
<syntaxColor id="CodeColor_JavascriptComment" text="#BBB" />
<syntaxColor id="CodeColor_JavascriptString" text="#68A2B0" />
<tagColor id="DWTagLibrary_templates" text="#009" />
<syntaxColor id="CodeColor_LibraryText" text="#000" bgcolor="#FFC" />
<syntaxColor id="CodeColor_DateText" text="#000" bgcolor="#FFC" />
<syntaxColor id="CodeColor_TemplateText" text="#999" />
<syntaxColor id="CodeColor_TemplateCommentText" text="#060" />
<syntaxColor id="CodeColor_TemplateCommentAttr" text="#060" />
</colorGroup>
</codeColors>
