今天在D7中成功安装了DevExpress.ExpressQuantumGrid.Suite.v5.9 Full Source，安装过程整理如下。
1.必须配套安装XP Theme Manager、ExpressLibrary、ExpressExport Library、ExpressDataController、ExpressEditors Library 5和ExpressPageControl 2，已经安装过的则跳过；
2.在Delphi 7中，选择菜单File | Close All（我的习惯）；
3.选择菜单Tools | Environment Options...，在Environment Variables页中，点击"New..."按钮，在Variable Name右边输入框中输入cxQGrid（或任意其他名字，但后面的设置要与此一致），在Variable Value右边输入框中输入DevExpress.ExpressQuantumGrid.Suite.v5.9的绝对路径（也就是你把DevExpress.ExpressQuantumGrid.Suite.v5.9包解压到什么目录，例如：D:/VCLPackages/DevExpress_ExpressQuantumGrid_Suite_v5.9/），按"OK"；
4.点击"Library"切换到Library页，在Library path后面加上：
$(cxQGrid)/XP Theme Manager/Sources;
$(cxQGrid)/ExpressLibrary/Sources;
$(cxQGrid)/ExpressExport Library/Sources;
$(cxQGrid)/ExpressDataController/Sources;
$(cxQGrid)/ExpressEditors Library 5/Sources;
$(cxQGrid)/ExpressPageControl 2/Sources;
$(cxQGrid)/ExpressQuantumGrid 5/Sources;
5.依次编译和安装下面各包：
---安装XP Theme Manager---
/XP Theme Manager/Packages/dxThemeD7.dpk 仅编译
---安装ExpressLibrary---
/ExpressLibrary/Packages/cxLibraryVCLD7.dpk 仅编译
/ExpressLibrary/Packages/dclcxLibraryVCLD7.dpk 编译和安装
---安装ExpressExport Library---
/ExpressExport Library/Packages/cxExportVCLD7.dpk 仅编译
---安装ExpressDataController---
/ExpressDataController/Packages/cxDataD7.dpk 仅编译
/ExpressDataController/Packages/cxADOAdaptersD7.dpk 仅编译
/ExpressDataController/Packages/cxBDEAdaptersD7.dpk 仅编译
/ExpressDataController/Packages/cxIBXAdaptersD7.dpk 仅编译
---安装ExpressEditors Library 5---
/ExpressEditors Library 5/Packages/cxEditorsVCLD7.dpk 仅编译
/ExpressEditors Library 5/Packages/cxExtEditorsVCLD7.dpk 仅编译
/ExpressEditors Library 5/Packages/dclcxEditorsVCLD7.dpk 编译和安装
/ExpressEditors Library 5/Packages/dclcxExtEditorsVCLD7.dpk 编译和安装
---安装ExpressPageControl 2---
/ExpressPageControl 2/Packages/cxPageControlVCLD7.dpk 仅编译
/ExpressPageControl 2/Packages/dclcxPageControlVCLD7.dpk 编译和安装
---安装ExpressQuantumGrid 5---
/ExpressQuantumGrid 5/Packages/cxGridVCLD7.dpk 仅编译
/ExpressQuantumGrid 5/Packages/dclcxGridVCLD7.dpk 编译和安装
6.恭喜你，你安装成功了！
谢谢ron_xin(星雨)，我是看了他的帖子才学会的。