To essentially eliminate the measuremental errors arisen from light source power and wavelength fluctuation,a measurement method of solution concentration by means of glancing incidence was proposed.The method is based on the relationship between solution concentration and the refraction angle of the medium transparent. Such a measurement system was developed. The relationship between critical light of refraction angle and the concentration was analyzed,introducing the structure of measurement system,and the researching of measured precision and practical. The system to measuring solution concentration of standard,the test data go to regression and demarcate. A mathematical formula is based on the relationship between solution concentration and refraction angle. Different concentrations of a set of sucrose solution,with the concentration being from 5% to 80%,were measured experimentally. The maximum absolute measurement bias is no more than 0.003%. Tests show this system prospectively with practical applications of engineering.