Under the background that homogeneous competition is difficult to achieve market success, the problem that the products produced by standardized batch production mode are difficult to meet the personalized needs of customers is becoming increasingly prominent, and civil aircraft production is in the same case. In order to meet the personalized needs of customers and win greater market share, the customization of civil aircraft products is an important way for aircraft manufacturers to achieve market success. There is a definite time requirement from the expression of customer needs to the final physical delivery of aircraft. Therefore, the customization of civil aircraft products is an engineering project with strict time constraints. This paper briefly introduces the basic concept of aircraft customization, and focuses on the method of making milestone schedule for civil aircraft product customization, and guides aircraft manufacturers to finally form civil aircraft product customization milestone schedule by identifying the key tasks of customization, clarifying the cycle time of key tasks and determining the deadline of key tasks, which is used to control the planning and process of civil aircraft customization.