The theoretical calculation and SIMPACK simulation analysis method were used to analyze the problem of sanding device deviating from its original track of a type of locomotive which was used in small radius curve in China. The theoretical calculation and simulation results showed that in the small radius curve the operation of sanding device could not sand on the center of the track, resulting in sand waste and could not achieve the purpose of improving the performance of the wheel-rail adhesion, which affected the safe operation of the train. Respecting the above-mentioned facts, a new type of hydraulic control device was proposed to solve the problem.