Mine hydraulic cylinder is an important working component of coal mine hydraulic support,and its performance is directly related to the production safety of the entire fully mechanized mining face.Based on the experimental tests,numerical calculation and simulation analysis,the eccentric loading performance and central overload loading performance of mining cylinders were analyzed.Referring to GB/T 25974.2—2010 "Powered support for coal mine:Part 2:Specification for power set legs and rams",the deflection data of mining hydraulic cylinders under eccentric loading conditions and the stress-strain distribution law of the hydraulic cylinder under the condition of central overload loading were obtained.The numerical calculation model of deflection and strength of mining hydraulic cylinder was verified by test datas.The research results provide reference data for the design and manufacture of the hydraulic cylinder for mining and the inspection of the corresponding hydraulic cylinder performance.