Abstract: In view of the complexity of existing motion simulation control of the hand,through the analysis of structure and movement characteristics of human anatomy,the movement and control mechanism of virtual hand was proposed which is based on multi-curve spectrum．For the movement of single finger,flexible movement of single knuckle can be driven by controlling the normalization contraction of muscle．However,in the cooperative movement of fingers,because the movement promotion and restriction relationship between adjacent finger exists,the effect of other fingers should be considered．According to the constraint relate,the coordinated movement can be realized by controlling the correspon-ding muscle contraction．Experiments show that the established control mechanism can well simulae not only the movement of single finger but also coordinated movement of fingers．Under the control of multi-curve spectrum,it is convenient and quick to simulate a variety of gestures and sign language．Besides,the movements are vivid,and the hand movements are natural and flexible.

Key words: Virtual modeling,Hand modeling,Muscle control,Multi-curve spectrum,Motion constraints