add the following text to .vimrc or .gvimrc:

if has("cscope")
    set csprg=/usr/bin/cscope
    set csto=0
    set cst
    set nocsverb
    " add any database in current directory
    if filereadable("cscope.out")
        cs add cscope.out
        " else add database pointed to by environment
    elseif $CSCOPE_DB != ""
        cs add $CSCOPE_DB
    endif
    set csverb
endif

nmap <C-@>s :cs find s <C-R>=expand("<cword>")<CR><CR>

nmap <C-@>g :cs find g <C-R>=expand("<cword>")<CR><CR>
nmap <C-@>c :cs find c <C-R>=expand("<cword>")<CR><CR>
nmap <C-@>t :cs find t <C-R>=expand("<cword>")<CR><CR>
nmap <C-@>e :cs find e <C-R>=expand("<cword>")<CR><CR>
nmap <C-@>f :cs find f <C-R>=expand("<cfile>")<CR><CR>
nmap <C-@>i :cs find i ^<C-R>=expand("<cfile>")<CR>$<CR>
nmap <C-@>d :cs find d <C-R>=expand("<cword>")<CR><CR>

当光标停在某个你要查找的词上时, 按下<C-_>g, 就是查找该对象的定义, 其
他的同理.
    按这种组合键有一点技巧,按了<C-_>后要马上按下一个键,否则屏幕一闪就回到
nomal状态了
    <C-_>g的按法是先按"Ctrl+Shift+-", 然后很快再按"s"