The current refractive index measurement methods are analyzed

and a fast and simple method for measuring refractive index of transparent optical materials is proposed. Firstly

the experimental device and optical path principle of the method are analyzed. Secondly

the refractive index of fused-silica parallel plate glass is measured by 650 nm semiconductor laser

and the uncertainty of refractive index is 0. 001 under the current experimental conditions. The measurement precision of refractive index measurement will be higher if a higher resolution oscilloscope and a parallel plate with higher parallelism are employed.