Abstract: In order to research adaptability of two-prop shield powered support for caving top-coal,applying field data,this paper analyzed action location of powered support's join forces,safety valve's open rate of balance jack,force state of front and back balance jack before and after top-coal caving,balance jack's horizontal force on top beam.Results showed that under the geological condition,balance jack effectively adjusted and kept powered support's attitude,amended action location of join forces and ensured stability of top-coal between face and top beam.Adaptability of this powered support was proven.This could be used to instruct actual operation and improvement of this powered support.