Modeled nonlinearity, time-varying, dynamic coupling finite element model of scraper conveyor according to its actual working condition in the mining, studied the transmission mechanism of bulk material power and its parameters test methods,constructed the shape function of scraper conveyor circuitry, realized the computer automatic modeling, by the example carried on digital simulation of all of working condition such as starting, freely stoppage, abnormal load, chains blocked, the difference of chain’s pitch and the chain wheel polygon effect, and so on.