The composition and function of the backfill plough were described and the main parts of the backfill plough were introduced briefly, the functions and composition of the adjustment mechanism of the backfilling plough were analyzed. The forward slip boots work posture adjustment was performed through the telescopic hydraulic cylinder of the adjustment mechanism, thus the principle diagram of the hydraulic system was established, and the two hydraulic cylinders were made to meet the synchronization and holding pressure. Then through AMESim software, the hydraulic system model was built. The hydraulic cylinder displacement, velocity, pressure and flow curves were analyzed by given different current to the electromagnetic reversing valve, to verify whether the hydraulic system could meet the requirements of the working condition.