To address the decision making problems of arriving control in calling system, this paper starts from the four factors that have influenced the importance of calling customers. It builds a customer importance degree assessment set, and proposes a calling assessment method and related algorithm implementation based on fuzzy synthetic evaluation. It has solved the problem of treating calling customer by designing an intelligent calling decision making system according to this assessment method. At last, by analyzing the loss with non-intelligent system, this paper verifies the intelligent system’s validity and feasibility.