A new CVD method without vacuum condition (CVDWV) was designed in this study, it had been found that by modifying the now rate of the carrier gas (N-2) and the temperature of surface reaction, silicon saturator and sample tube, the amount of silica deposited on the external surface of the zeolite could be precisely controlled, The changes in the physicochemical properties of zeolite, such as pore-opening size, acidity and reaction property were investigated. The results obtained showed that: modification of the improved CVD method did not change the internal structure and acidity of the zeolite, but could bring about significant change of pore-opening size and reaction property as desired.