Abstract: As the compass for the advance of modern society, the navigation system has penetrated into daily life, science and technology culture, national economy, military tasks and other fields, and is an essential infrastructure for the normal operation of modern society.As a typical representative of land-based longwave navigation system, Loran navigation system is an important part of the global navigation system. Due to its relatively low navigation accuracy, its role in the global navigation system is declining.In recent years, the improvement of accuracy of long-wave navigation system is mainly achieved by setting up difference stations, but this method has high cost and low update rate of correction data.To solve this problem, a new differential Loran navigation system is proposed in this paper, and the key technologies are briefly introduced, analyzed, simulated and tested.