Terrain Awareness and Warning System (TAWS) is effectively for preventing a Controlled Flight Into Terrain (CFIT) accident, and this makes the civil air much more safe. Years ago, the TAWS technology became mature in the world, but is just started in China recently. With the experience of aircraft system design, this paper here covers the functions and disadvantages of Ground Proximity Warning System (GPWS), and focus on the new functions of TAWS. Special for the forward looking functions of TAWS, this paper research and analysis on TAWS and tell the advantages and some disadvantages that exist with TAWS now. In the end, this paper predicts the development of TAWS for future civil air.