In order to solve the problem of loss of gloss in two-component varnish underexternal mixed spraying mode，a microscopic model of the reaction was established based onthe principle of the reaction between the main agent and the curing agent，the reasons were analyzed. The results indicated that the loss of gloss in two-component varnish was caused bythe low dissolution of the curing agent，the difference in the proportion of main agent andcuring agent in the local small unit of mixed varnish. The benzene solvent in the curing agentwas adjusted to an ester solvent with high solubility for both the main agent and the curingagent，and the loss of light was eliminated. The method of improving the solvent solubility ofthe curing agent to cope with the loss of light provided a new idea for the solution of similarproblems and the selection of solvent for varnish manufacturing.