The work aims to study the effect of temperature and corrosion inhibition pressure in the package on the vapor phase rust prevention effect by electrochemical method, to provide data reference for obtaining a long effective life of vapor phase rust prevention in actual working conditions. 10# steel and cast iron were used as working electrodes. The corrosion inhibition process of the specimens at different temperature and pressure was studied through AC impedance spectroscopy and dynamic polarization curves. The change rules of electrochemical parameters were analyzed, and the corrosion inhibition effects were evaluated and compared. The results of AC impedance spectrum showed that the surface impedance of metal specimens decreased with the increase of temperature and the decrease of corrosion inhibition air pressure, and Warburg impedance appeared in the region of high temperature and low frequency, and the corrosion mechanism changed. The results of dynamic polarization curve showed that the corrosion current decreased and the corrosion voltage decreased with the increase of temperature and the decrease of corrosion inhibition air pressure. It is concluded that both the increase of temperature and the decrease of corrosion inhibition air pressure in the package would cause decrease of metal vapor phase rust prevention effect, and the corrosion inhibitor is more sensitive to the change of corrosion inhibition air pressure after heating up. To prolong the effective life of the vapor phase corrosion protection package, it is required to pay attention to the high temperature working condition and ensure the stability of corrosion inhibition air pressure in the vapor phase corrosion prevention package.