每一个选择框不同的name
<select name="
T1">
<option value="">请选择</option>
<option value="11111">11111</option>
<option value="22222">22222</option>
<option value="33333">33333</option>
</select>
<select name="
T2">
<option value="">请选择</option>
<option value="77777">77777</option>
<option value="88888">88888</option>
<option value="99999">99999</option>
</select>
接收的时候
if request.form("T1")="" then
response.write "对不起,至少选择一个!"
else
T1=request.form("T1")
end if
if request.form("T2")="" then
response.write "对不起,至少选择一个!"
else
T2=request.form("T2")
end if