A semiconductor inspecting method for ensuring a scrubbing length on a pad includes following steps. First off, a first position of a probe needle from above is defined. In addition, a wafer comprising at least a pad is placed on a wafer chuck of a semiconductor inspecting system. Thereafter, a relative vertical movement between the probe needle and the pad is made by adopting a driving system of the semiconductor inspecting system to generate a scrubbing length on the pad. Next, whether the scrubbing length is equal to or larger than a preset value or not is recognized by adopting the vision system and the relative vertical movement is stopped by adopting the driving system.