At present,in the auxiliary transportation industry of coal mine,the short distance material handling and loading and unloading work in the underground basically depends on manual work,which is characterized by high labor intensity and low work efficiency.In view of the above problems,the hydraulic system of short distance self crane was designed.Through the introduction of the mechanical structure of the transport crane and the analysis of the work flow,the initial data of the relevant hydraulic cylinders were determined.The parameter calculation of the hydraulic cylinder,the selection of the hydraulic motor,the parameter design of the hydraulic pump and the design of the oil tank were completed.The work flow of the entire hydraulic system was analyzed,PLC control system was determined to control the hydraulic circuit,and the hydraulic schematic diagram of the transport crane was designed.Through the calculation of various pressure losses in the hydraulic system,it is shown that the pressure loss is within a reasonable range,which proves the reliability of the designed hydraulic system.