1. A system for analyzing length differences in differential signal paths, the system comprising: a storage device configured for storing a design file of the differential signal paths; and an analyzing module configured for analyzing the differential signal paths to obtain analyzed information, the analyzing module comprising: a simulator configured for loading the design file from the storage device, and for simulating the differential signal paths based on the design file; a dividing sub-module configured for dividing simulated differential signal paths into a plurality of segments by impedance division positions that show impedance discontinuity; an analyzing sub-module configured for predefining an acceptable length difference limit for each divided segment, for calculating a real length difference for each divided segment, and for comparing the real length difference with the acceptable length difference limit correspondingly to generate a plurality of analyzed results corresponding to the plurality of divided segments; a selecting sub-module configured for selecting one or more segments compared by the analyzing sub-module to check analyzed results of selected segments; and an output sub-module configured for locating the selected segments in the simulated differential signal paths, and for generating the analyzed information comprising analyzed results of the selected segments.