Trajectory of the rice seed motion after collision with inclined plane was tracked by a HSVC(high speed video camera) and a high-resolution camera separately from vertical and horizontal direction. Through image analysis captured from video, effects of contact materials, seed charge height and inclined plane obliquity on all motion parameters of the collision were detected and analyzed. The results showed that as seed charge height increased, the maximum height of the first bounce H1 and the displacement along the direction of the slope L1 increased linearly. With the increase of inclined plane obliquity, H1 reduced linearly and L1 increased exponentially. Using quadratic orthogonal test with two factors, the seed motion forecast model was established with seed charge height and inclined plane obliquity as independent variables and lateral deviation angle of seed motion plane as objective function. The research results provide reference for structure design of seed drop tube.