Abstract: In production practice，influenced by coal mining technology，geological conditions and other factors，the working face cannot achieve full mining at the same time in coal seam strike or dip.So，the issue faced is how to convert some calculation parameters of probability integral method under the condition of small face mining into parameters under full or close to full mining conditions.Also，correction in factor of subsidence is the key to calculate the parameters by small-face probability integration method.After contrast on calculating parameters of different working faces under similar geological conditions，it is indicated that the correction rules of existing subsidence coefficient is applicable to this mining area.

Key words: Small face, Full mining, Factor of subsidence, Calculation parameters