Objective To develop a new silane compound which can replace the traditional chromate passivation solution in aluminum surface treatment. Methods KH-560 and A-151 were compounded, and self-made waterborne polyester was added as hydrolysis agent together with a crosslinking agent R carrying active groups. The effects of silane agent ratio, dosage of hydrolysis agent and crosslinking agent R on the stability of silane treatment agent and corrosion resistance of silane film were investigated.Results When the ratio of KH-560 and A-151 was 4: 1, and the amount of hydrolysis agent was in the range of 0. 4% ~ 0. 6% , the storage time of treatment agent lasted more than 90 days, and the silane film had good corrosion resistance. For silane treatment agent with performance significantly decreased after long-time storage, demonstrable cross effect in silicon hydroxyl was formed through adding 4% crosslinking agent R, which could effectively enhance the protective properties of silane films. Conclusion The comprehensive properties of silane compound could meet the demands of industrial application, and the problems of environmental pollution by chromate passivation solution could be solved by the use of this new compound, which has good social benefits.