Abstract: In order to realize the safe mining under cretaceous Klzd aquifer of 12511 large mining hight working face of Bulianta Coal Mine, the method combining the observation of the loss of drilling fluid and the observation of color drilling television is adopted through using ground construction downward drilling to carry out the actual measurement research on the overlying strata movement law of the large mining height working face near the shallow seam. The research results show that the height of the water-conducting fracture zone of the 1^# observation hole in the middle of the working face is 104.48 m, and the height of the caving zone is 33.70 m. The height of the water-conducting fracture zone of the 2^# observation hole of the working face is 122.90 m, and the height of the fall zone is 37.40 m. The distribution of the “two bands” of the overburden of the working face presents the rule of two sides high and middle low.