Abstract: In this investigation, a formulation of OT cationic asphalt emulsion has been established by using theoreical analysis, physicochemical data and experiments. The dune stabilization experiment conducted in Tenggar desert and road pavement test, which covers an area of13,000 square metres, show that the formulation is an excellent one. According to the properties of asphalt a te mpera-ture control equation for emulsif ication was deduced from the thermal equilibrium equation, this leads to the effective control of temperature factors of water solution and asphalt as well as mixed temperature.