In order to deal with the problems of laying and assembly planning of slender flexible parts in electromechanical products,a novel approach to operate the physically-based slender flexible parts in an augmented reality environment is presented in this paper.A discrete dynamic method is used to efficiently build the physical model of slender flexible parts,which is very well suited for interactive operation in the augmented reality environment.In this model,bending penalty force can be calculated by the bending energy function to improve dynamic bending behavior,and a penalty method is used to simplify the calculation of geometric torsion.With a reasonable construction of augmented reality environment,a real-time interactive algorithm based on the operating panel is proposed to enable users to interact with the virtual slender flexible parts in the mixed reality-based scene.A case study in the augmented reality environment shows that the proposed approach is efficient and feasible. In order to deal with the problems of laying and assembly planning of slender flexible parts in electromechanical products, a novel approach to operate the physically-based slender flexible parts in an augmented reality environment is presented in this paper. A discrete dynamic method is used to efficiently build the physical model of slender flexible parts, which is very well suited for interactive operation in the augmented reality environment. In this model, bending penalty force can be calculated by the bending energy function to improve dynamic bending behavior, and a penalty method is used to simplify the calculation of geometric torsion. With a reasonable construction of augmented reality environment, a real-time interactive algorithm based on the operating panel is proposed to enable users to interact with the virtual slender flexible parts in the mixed reality-based scene. A case study in the augmented reality environment shows that the proposed approach is efficient and feasible.