In astronomical speckle imaging, based on a new datum point for shifting that is the maximum value point of the autocorrlation of the object, a new astronomical image reconstruction method working in spatial region——iterative shift-and-add technique (ISA) is advanced. It can be applied to remove atmospheric turbulence influence effectively and thus the astronomical imaging with the diffraction-limited resoulition of the telescope will be achieved. After describing the principle of the method, the image reconstruction experiments of some astronomical obejcts are given.