Abstract: The analysis method of silicon,aluminum and titanium in perlite was established based on its composition.The sample was melted with sodium hydroxide at 650 ℃ and soaked out by hydrochloric acid.Then the silicon was determined by gravimetric method using animal glue for fast agglomerating silicon acid,the aluminum determined by titration with EDTA replaced by sodium fluoride,the titanium determined by spectrophotometry with hydrogen peroxide.The method had been applied to the determination of silicon,aluminum and titanium in perlite with the relative standard deviation of 0.56%0.74%,1.08%1.13% and 1.92%2.02%,respectively.The proposed method was proved to be convenient.The results obtained were accurate and able to satisfy the request of chemistry analysis and the need of quality control.