Shell powder is not only a kind of natural resources but also has a very good application value. It has a strong adsorp tion, antibacterial and fireproof ability, which could significantly improve the performance of the coating while added to the coating. In this paper, a kind of solid shell powder coating was prepared and its effect on formaldehyde adsorption was studied. Taking formalde hyde adsorption content as the index, response surface methodology (RSM) was employed to optimize the main process parameters (shell powder dosage, gelatin dosage and lithopone dosage) and investigate the regression model. The results of variance analysis showed the regression model reflected the effect of shell powder, gelatin and lithopone on formaldehyde adsorption. The optimum condi tions were obtained as follows: shell powder 60 g, lithopone 12 g, gelatin 6 g. Under these optimized conditions, the adsorption formal dehyde content of the coating was 5. 87 g / kg.