Abstract: Foam can be used as the carrier of chloride salt inhibitor. The inhibition foam is a kind of comprehensive coal spontaneous combustion prevention and control material which not only has great performance of coverage and accumulation of the foam, but also has the inhibition effect on coal spontaneous combustion. In this paper, the surfactant was selected as the foaming agent, and the foam stabilizer was used to improve the stability of the foam. The foam with better properties was achieved and the optimal concentration of the foaming agent was determined through the experiment. Three kinds of common inhibitor, NaCl, MgCl₂ and CaCl₂, were selected in the experiment to test the influence of inhibitor's concentration on foam performance. It was found that CaCl₂ can fit in well with the foam, and form the inhibition foam with better performance.