Abstract: This paper provides a load test program, a series of static strain-load curves and load spectrum of hoisting system of drilling rig type ZJ45J produced by our country. Experimental observation has found that all hoisting parts are safe in strength while hook load up to 350t. Except hoist link and wire rope. The hook load varies as a sinusoidl damping oscillation combined of two different freguencies in pulling out the drilling string. The higher the hoisting speed, the higreater the acceleration and dynamic hook. Practical data different from those in foreign litertures are obtained, such as dynamic load coefficient, power stoer coefficient, shiftgears load and efficiency of single pulley.These test datas and some recommendations can be used in drilling rig design and operation.