Phase unwrapping is a common problem f or many phase measurement techniques,which restores original continuous phase fr om the wrapped phases.In this paper,an improved algorithm of phase unwrapping ba sed on radial basis function with adaptive parameters is proposed.Firstly,the image is divided into some blocks,an d then the width of the radial basis function of each block is determined according to the complexity of the corresponding block.The experimental results show that the algorithm has be tter robustness compared with the original radial basis function algorithm,the classical method of the quality map,and graph cutting method in different noise levels.