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Currently Intelligent Power Switch (IPS) is substituting the fuse and relay in automotive electronic systems due to its simplicity in design, assembly, and maintenance as well as its advantages of cost reduction. As the percentage of IPS in automotive power system gets higher, the stability and credibility of the automotive power system depends more by IPS evaluation. Since IPS is semiconductor device, the performance is more influenced by its ambient temperature than replacing fuses and relays. As reliability is one of the most important characteristics in automotive system, wire protection, over-current protection, and short-circuit protection should be considered. The evaluation algorithm of IPS must include these characteristics. This paper describes the algorithm development of effective IPS (Intelligent Power Switch) evaluation software for automotive applications.