Abstract: Aiming at the problems of uneven steam distribution and uneven producing performance of oil layers caused by the two points steamed-suck model of thermal horizontal well in heavy oilfield of Karamay, in accordance with model analysis of steam absorption capacity with heavy oil horizontal well at home, the influencing factors of steam injection technology at present have been qualitatively analyzed and the analytical model of two points steam injection horizontal section has been established. Balanced steam distribution at different points of horizontal sections in horizontal wells can be realized by using the steam distribution valve that can be automatically adjusted which as a result will improve the producing performance of horizontal sections and enhance the development effect of horizontal wells.