On the basis of analyzing complete camera distortion model,a new calibration algorithm is proposed.The new algorithm consists of three steps.In the first step,the calibration parameters are estimated using a close-form solution based on a distortion-free camera model.In the second step,estimating the set of distortion parameters with the other parameters fixed.In the third step,the parameters estimated in the first step are improved iteratively through a nonlinear optimization,and makes all the parameters globalization.Very good results are obtained with real data calibration.The results show the precision of the new proposed method is up to 0.0367 mm,which meets the requirements of high precision 3D measurement and other application.