With the openning of low-altitude and development of general aviation, low-altitude airspace flow will increase dramatically, this is bound to cause more flight conflics.To solve the problem of low-altitude conflict, this paper gives a conflict avoidance algorithm based on ADS-B information, in order to offer the pilot with reasonable avoidance strategies if needed. Firstly, the algorithm excluded the safe aircrafts after analyzing situation around plane by using relative motion.And then researched collision resolution strategies for the potential conflict aircrafts,including course change and speed change.Finally, validity of the algorithm is verified through the computer simulation. Simulation results show that this algorithm is correct and effective, which can quickly find the flight conflics and give collision resolution strategies, and the validity of course change is better than speed change.