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Nowadays, the services on the World Wide Web (WWW) are proliferating dramatically. The relationships of invoking among these services are becoming more and more complicated. The performances of traditional automated service composition methods suffer from the complexity of the service composition problem. Hence it is hardly to apply these automated methods in real cases. Semi-automated service composition is an alternative for coping with the complexity of service composition. A novel end-user oriented service composition model based on quotient space theory and service relation diagram is presented. This model proposes a hierarchical service composition from coarse-grain to fine-grain. The performance analysis and simulation showed that this model can reduce the complexity of service composition efficiently.