Abstract: Under the three environments,normal temperature,heat and ultraviolet light,we test the light reflection spectra of the 5%,10% and 15% Ti-doped SnO₂ thin films which made through the Sol-Gel method（sol-gel） method,in ethanol,acetone to study the properties of the film to return.Research and analysis shows that the return properties of Ti-doped SnO₂ thin films under heating environment are much better than room temperature environment.Furthermore,the time is reduced from 10 hours to 5 minutes.In addition,it has good return properties and time under ultraviolet light,and more secure,convenient.We believe in the future it can have wider application.