The precision of micromanipulator is affected by the performance compliant spring.With consideration of nonlinearity and large deformation
the mechanics analysis model of compliant spring is built based on principle of Bernoulli-Euler equation and pseudo rigid body model is proposed.The relationships among property of load
displacement
curvature etc and geometrical parameter are studied and the mechanics equation is obtained.Finally
the validity of this model is verified by experiments.This research has reference value on design of precision micromanipulator.