Abstract: For computational efficiency and stability of cloth physical modeling,proposed a cloth mass-spring model based on constraint.Taking geometry sphere and cylinder as examples,the paper explains the whole strategy which is used to deal with cloth deformable bodies colliding with environment object.The procedure of physically based simulation is described.The experimental results reveal that the computed data according to the model is very close to the actual values in spite of the complexity of the cloth geometry and it is suitable for real-time simulation.The above research results are applied to 3-D garment simulation environment,and examples are presented.