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Abstract:The key to solving contradiction between personalization and low cost is to realize the modularity of PSS. In order to achieve maximum customer satisfaction andthe lowest lifecycle cost for PSS, module portfolio of services solution layer of Product-service System(PSS) should be planned reasonably. Firstly, a methodology of module portfolio planning for PSS service solution layeris proposed, the methodology consists of four phases (including five steps), which namely are service needs acquisition phase, finding principle solution and building modular rough structure phase, configuring principle solutionportfolio phase and evaluating modular solution phase. Detailed technical steps and implementation methods for each stage are presented.Secondly, a evaluation method for PSS module portfolio solution based on utility price ratio is proposed. Based on customer utility and lifecycle costs of PSS,the solution was carried out with the maximum ratio between customer satisfaction and the usage. Finally, a case study onPSS solution of a power transformer is carried out to validate the methodology proposed in the paper.