Abstract: According to the characteristics of the formation and the logging data of the boreholes in Hongqinghe coal mine, the strata in the study area were re-divided, and the sedimentary law of the strata was studied by combining with the mark of the sedimentary facies. The results showed that the 3th section of Yanan formation was mainly composed of delta plain subfacies, developing three near the north-south rivers and two near the north-east rivers with the ratio of sandstone thickness to formation thickness greater than 0.4 at distributary channel, and the 1st and 2nd section of Zhiluo formation were mainly composed of braided river and riverbed and flood plain of sedimentary subfacies developing several near the northwest-southeast rivers with the ratio of sandstone thickness to formation thickness between with 0.6 and 0.8 at river center. The results can provide a basis for the evaluation of water abundance later.