Iterative shift-and-add technique(ISA) refers one of the space domain statistical reconstruction methods. The experiments of the space domain statistical reconstruction, of which objective is the multipoint-source objective such as binary star, show that the effect of ISA is better than the speckle masking and also its speed is faster than the speckle masking. ISA cannot be directly used to the high-resolution reconstruction of astronomical and space extended objective such as the sun or satellites so that this article discusses the possibilities of applying ISA to extended objective reconstruction by modification and carries out numerical simulation experiments of high resolution reconstruction of satellites under different photon noises. The simulation experiments show the improved ISA can silence photon noise and for the faint expanding objective reconstruction it has better reconstruction effect than frequency reconstruction method such as speckle masking.