After throwing the cylindrical dice，it can have the same probability to stand on one of the upper surface，lower surface and side when it falls，explore the factors affecting the probability and obtain the relevant optimal parameters．Firstly，the equation of the relationship between influencing factors and probability is listed．The pybullet physics engine of Python is used to simulate the motion behavior of the cylindrical dice from throwing to landing．The real-time data of geometric parameters，physical parameters and probability obtained from the simulation experiment are recorded in Excel．The simulation data are fitted by Origin，and the images of different geometric and physical parameters and probabilities are depicted．It is found that the geometric amount of the dice α 1，α2 ，the physical mass m，and the recovery coefficient e will affect the landing state and

landing probability of the cylindrical dice．