The traditional titanium solution cooling crystallization method with thermal compression has problems of high en-ergy consumption,low efficiency,large secondary sewage and difficult cooling in summer.A new mechanical flash cooling crystallization method was proposed,and the system performance under summer condition was performed.The results showed that compared with the traditional method,the new method under summer condition（cooling water temperature is 34 ℃） can shorten cooling time by 24.2%,reduce production cost by 67.6%,decrease standard coal consumption by 92.4% and reduce the secondary sewage 20 000 m ³/a.As a new energy-saving and environmental protection technology,the mechanical flash cooling crystallization technology has broad market application prospects in the field of inorganic salts.