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.