Abstract: To avoid the defect of current clear fracturing fluid such as poor property at high temperature and high cost of application, an improved water-based clear fracturing fluid is developed, which consist of main agent CTAB, temperature control agent Na2S2O3, clay inhibitor KCl. The performance is tested through laboratory experiments. Results show that the shear and high temperature resistance of the improved clear fracturing fluid are better. It also has high proppant-carrying capacity in the alkali environment blow 85 ℃, when it contacts with diesel oil or crude oil, it can gelout in two hours without residue left. The break raffinate is compatible with the formation water and crud oil.