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Through analyzing the influence factors of assembly process, an evaluation index system is proposed, According to assembly precedence relationship and the parallelism characteristics of actual assembly sequence, a new algorithm-"Optimal order reference set" is proposed to calculate assembly membership degree of unit level index. Concrete application steps are verified through a case study. Analysis of the example shows that the proposed method satisfied the requirements of practical process rules and the integrity of index system. By the new method, optimal selection of geometric feasible assembly sequence is realized. This method has realistic significance to automatic assemble application.