The exploitation of high-temperature and low-permeability oil and gas fields is of great significance to the sustainable developments of china's oil and gas resources. The‘13th Five-year’major national research and development projects require the development of a fracturing fluid system with reliable rheological and sand-carrying properties for application in 240℃ reservoirs. In this paper， the fracturing fluid systems with temperature tolerance above 170℃ were reviewed. The characteristics of vegetable gum fracturing fluid， polymer fracturing fluid， mixed fracturing fluid and temperature tolerant cross linking agents were analyzed， respectively. Suggestions for the development of 240℃ fracturing fluids were put forward.