To fulfill the accuracy requirement of precision NC machine tools, a kind of closed hydrostatic guideway system was designed based on thin film feedback throttler, and the structural parameters of the guideway were calculated according to the infinite stiffness principle. Three-dimensional software SolidWorks and Gambit were used to establish oil chamber model of hydrostatic guideway and generate mesh respectively. Under the same inlet pressure, the distribution laws of flow field in static pressure chamber and temperature field were obtained respectively during the guideway stopping and moving. It is concluded that, the distribution of flow field in static pressure chamber is symmetrical, and when relative velocity increases, the pressure near edge zone of flow field in static pressure chamber decreases unregularly, and the temperature of the zone rises increasingly, which will cause cavitation, oil emitting heat and the kinematic accuracy of guideway reducing.