Based on the vector diffraction theory and by using the optimizing toolbox in MATLAB, a five-zone amplitude and phase hybrid filter is designed to increase the focal depth of a near-field solid immersion lens (SIL) optical storage system. In the process of design, the spot intensity is constrained to half of the spot intensity without a filter and the spot size is constrained to equal to the spot size without a filter. When the designed filter is applied in a SIL near-filed optical storage system it improves the focal depth by 1.6 times. At the same times, it effectively restrains the expansion of recorded spot size with the increase from the SIL-air interface.