In order to analyze the split mining ratio of 1327 working face in Xima Mine after paste like filling mining, the method of field measurement was adopted in this paper. On the basis of fully investigating and mastering the filling mining background and filling mining technology of 1327 working face, the actual mining thickness after filling mining was obtained through field measurement and theoretical calculation, that was, the equivalent mining height was 0.541m.The method of borehole imaging and peeping was used to measure the height of the water diversion fracture zone, and the monitoring scheme according to the site construction situation was designed. Through the monitoring results of the water diversion fracture zone at six measuring points, the overburden damage range was got, and finally the height of the water diversion fracture zone after the face filling mining was 13.2 m. According to the concept of split mining ratio, the split mining ratio after paste like filling mining in 1327 working face of Xima coal mine was 24.4.