In order to improve the leveling system accuracy of working platform, a research was done on the velocity matching rule between leveling and boom luffing mechanism. Matching coefficient that was the ratio of luffing and leveling output angular velocity was proposed, which was a matching criterion to evaluate the inputout matching. A virtual prototype model was built of electromechanic hydraulic aerial working platform, and the matching rule was analyzed separately between leveling system of platform with lower arm luffing and upper arm luffing mechanism. The results show that the closer to 1 of the matching coefficient, the higher the matching degree is. Moreover, the more quickly the matching coefficient approaches to 1 during the arm startup, the lower the platform inclination angle is. The change trend of matching coefficient is consistent with that of the platform inclination angle during the arm lifting. The rationality and availability of the matching criterion are verified based on matching coefficient, which provides an effective method to evaluate the leveling system dynamic performance.