In astronomical speckle imaging technique, the method of iterative least square (building block) proposed by Hofmann et al. can avoid the complex phase retrieving process when phase spectrum was recovered from the bispctrum of an observated object image, and so the phase error transmission and accumlation were removed too. But this method needs a great quantity of iterative steps of putting blocks and a long term processing. For to raise the efficiency of the method, the means of “iterative shift and add” was used for pretreating the speckle images of the object. After a few steps of shift and adding, the basic structure and distribution of the object image were provided quickly and the position of points putting blocks was got, and so blind putting was avoided, thus the iterative steps were reduced greatly and the efficiency of the method can be increased obviously.