In the process of civil aircraft test flight, different test flight subjects need to be carried out in different natural environments, so it is necessary to conduct frequent transfer flights; In addition, there are functional and reliability test flights, route demonstration flights and other route flight tasks during the process of civil aircraft test flight. As the test flight aircraft has not obtained the type certificate, there are many special restrictions on airworthiness conditions. So it is necessary to make special route for test flight aircraft. In this paper, we present a fast planning algorithm for civil aircraft test flight routes, which takes into account the special requirements of test aircraft for routes, incorporates Dijkstra's algorithm, and can quickly construct routes suitable for test aircraft by combining existing route resources, and gives an implementation example of the algorithm. The results show that the route planned by this method is effective and reliable.