The current virtual reality modeling methods based on CAD models have too many model patches, long and ill-conditioned triangles. Therefore, it is difficult to meet the real-time rendering and visual requirements of the virtual reality system. This subject proposes a method of simplification and conversion of CAD models and applying them to virtual systems. First, the existing CAD models are exported to an intermediate format and analyzed to obtain mesh data, and then a new classification-based adaptive simplification is used. The algorithm performs multi-resolution simplification on the grid, that is, first classifies the grid according to the characteristics of the grid model, and then performs targeted simplification on the basis of the classification. This article mainly uses the kinematics method to analyze the technical movements of the cross kick, supplemented by the analysis of the dynamics. Through a comprehensive analysis of the data of the horizontal kick technique, the internal laws of the Taekwondo horizontal kick technique are explored from multiple angles, which provides a reference for improving technique, guiding teaching and training. The research results of this paper show that the correct working sequence of muscles is an important condition for improving muscle work efficiency, and it is also an important guarantee for improving link speed. The muscles of each link should work in the order of large and small, and the angle of each link should be within a reasonable range. The waist and hips are the hinge between the upper and lower limbs. The two swings of the upper limbs and the cross changes of the legs are inseparable from the waist and hips. © 2022 CAD Solutions, LLC,.