The effect of breathing and anti-overflow of the breathing valve mounted on petroleum tank have great influences on the safety of the whole truck. This paper designs one kind of new two stage pressure-controlling anti-overflow breathing valve. The 3D model of the breathing valve is built in Pro/E, and the kinetics analysis of the key point of the breathing valve is done in ADAMS, which can provide theoretic guidance for designer to optimize structural design. Copyright © 2013 IFSA.