Supplementary exploration has been carried out in Maozhuang coal well of Ningyang coalfield. In the supplementary exploration, 34 boreholes have been drilled, and the total project amount is 11366.38m. Logging work has been carried out in all boreholes, and the total logging amount is 11295.20m. Coordinate and elevation of all boreholes have been measured, and coal quality analysis has been carried out in 16 samples. Mining coal strata in exploration area are 4 layers (upper part of No.3 section, lower part of No.3 section, No.16 section, No.17 section), and the average thickness is 9.18mm. Among mining coal strata, upper part of No.3 section and lower part of No.3 section are stalbe coal strata; No.16 section and No.17 section are relatively stable coal strata. They all have simple structures. Total recoverable reserves and pre-recoverable reserves are 150.7 ten thousand tons.