Abstract:The collector pressure control is the key to recovery system of condensing water recovery device in the heating system. This paper adopts the fuzzy control ideas, with the aid of Matlab / Simulink simulation technology to design pressure fuzzy controller of water collecting tank of internal. By use of the water collecting tank of internal pressure fuzzy to control electric valve's opening of the exhaust steam stabilize pressure inside the collector in a certain range.This would effective control internal pressure of water collecting tank.Thereby control water vapor content of the tank internal to preventing cavitation of pump. This electric intelligent pressure fuzzy control system can let the water recovery equipment device operation in multiple public network, constant pressure and level, high temperatures, the fully automatic, safe and reliable status.