The general situation of Satellite-Based Augmentation System at home and abroad is introduced, and the performance evaluation technology based on satellite navigation system is studied. Depend on the application of Beidou Satellite-Based Augmentation System, a performance evaluation system based on the Beidou Satellite-Based Augmentation System is designed and implemented. By calculating the location and protection level, the performance indicators such as accuracy, integrity, continuity and availability are analyzed and evaluated.