APEX method is a kind of non-iterative restoration approach, can be applicable to some real-time situation. There is a problem that its result point spread function (PSF) can not be sure energy is conversation in finite support area. The PSF was restrained non-minus and linear unitary based on the APEX method, pointing to the degradation character of opto-electronic image, and the approximate constant A and frequency center domain Ω was improved. At last, reconstruct the restoration image utilizing slow evolution of continuation boundary (SECB) method, give the reference conclusion for how to select the reconstruction factor K and s. The simulation indicates the improved algorithm enhanced its stability, the effect of restoration also has been improved.