Distributed collaborative development is a part of large-scale and complex product development strategy, and task allocation is the key decision in the planning stage of distributed agile collaborative development project. Combined with relevant theories and previous studies, this paper constructs a distributed task allocation model for product development based on contract net protocol, and introduces the priority of task importance into the task allocation model, and simulates the model through an example，to verify the feasibility of the proposed method. The results show that the proposed method is more suitable for distributed agile development projects, and can improve the efficiency of distributed agile development projects.