The classic MOSSE algorithm is often used for real-time target tracking. Aiming at the problem that the fixed filter update rate is difficult to adapt to the drastic change of the target appearance and the target is lost, an improved MOSSE tracking algorithm based on dimension analysis is proposed. This method uses Buckingham theorem to analyze the main factors that affect the update rate of the filter, establishes an update rate prediction model and automatically reloads the update rate. The improved algorithm can improve the robustness and tracking quality of target tracking.