This study proposes a method for measuring refractive index by combining a laser and a linear arrayCCD. It takes advantage of the lateral displacement produced when light passes through parallel plate media toachieve eficient and accurate measurement of refractive index and concentration of transparent media. The device employs a red point laser as a stable light source , attenuating the light intensity through a neutral densityfilter,and precisely adjusting the ineident angle using a rotating platform. Subsequently, the linear array CCDsensor captures changes in the position of the light spot , and the data is processed in Matlab to realize real-timemeasurement of the relractive index and concentration of transparent liquids, Experimental results demonstrateminimal errors and high stability when measuring, PMMA, glass , and solutions of various coneentrations. Thisdesign is also suitable for educational purposes , aiding in the understanding of the coneept of refractive index.The research provides an innovative perspective for relractive index measurement, laying the technical foundation for future studies.