The invention relates to a service-based communication network reliability test section construction method. The service-based communication network reliability test section construction method is characterized by comprising the steps of: (1), defining evaluation requirements of a network, and determining the task scenario of a system according to the evaluation requirements; (2), defining a network task, then, decomposing the task to define task stage information, and obtaining an event experienced within the time when the task is completed and the time sequence description of an environmentthrough each piece of task stage information, so that a task profile of the system is obtained; (3), for each task stage, integrating and decomposing the task stage, and extracting a specific communication service, a movement condition and a related environment; (4), determining communication service information in each task stage, and constructing a communication service profile; (5), determiningnode movement information in each task stage, and constructing a movement profile; (6), determining environmental information in each task stage, constructing an environmental profile; and (7), synthesizing the communication service profile, the movement profile and the environmental profile, so that a test profile directly used for a test is obtained.