转义一下,尝试用 [ ]
string sqlstr = "insert into 流域重点河湖实时水情 select [日期(m)], [太湖(m)] ....
或者
string sqlstr = "insert into 流域重点河湖实时水情 select 日期[(]m[)],太湖[(]m[)]....
问题要简单,错误须详细@错误/异常/堆栈信息+操作系统+软件版本+all the context of the issue Hope Helpful | http://www.leoworks.net