Through factual drilling information under the well in Quanshang coal mine of Tengxian coal mine,effects of limestones in the lower part of No.10 stratum,water abundance characteristics and Yuemengou formation in carboniferous-permian is analysed in this paper.It is regarded that in mining No.16 coal stratum,the rule of " discharging and descending pressure in deep part,and mining coal in shallow part" should be followed.While in mining No.17 coal stratum,water in Ordovician limestone will have no danger.