The effects of viscosity design and packaging design of decorative caulking agent on storage,transportation and construction were discussed.The design method of viscosity of decorative caulking agent was analyzed.The effect of viscosity of decorative caulking agent on droop and extrudability was studied.The results showed that the optimum range of viscosity of decorative caulking agent was 30000?100000 mPa·s.At the same time,the advantages and disadvantages of the design of the mixing pipe,nut,tube body and tail plug of double tube decorative caulking agent are analyzed in depth.