Designing a new type of vent flap mechanism could achieve monitor door latch and lock mechanism, prevention of pressure, quick release pressure function, failsafe, 2 psi locking, icing and many other functions. Adams software is used to simulate the dynamic simulation of the vent flap mechanism to meet the requirement of dynamic. On the basis of the dynamic simulation, the static strength analysis is done for the vent flap mechanism, and the result meets the design requirements. Research results show that the new type of vent flap mechanism design is feasible. It not only reduces the weight of the mechanism, but also increases the safety of the mechanism, and the complete design flow of the vent flap mechanism of civil aircraft pressurized door was given. The research can provide the necessary technical base for the future vent flap mechanism of civil aircraft pressurized door.