The relationship between specific rotation of one kind cholesteric liquid crystal for CH-LCD and incidence wavelength, screw-pitch is simulated with the general cholesteric liquid crystal optical rotation theory and analyzed quantitatively. The specific rotation-temperature characteristic of this kind cholesteric liquid crystal is measured by means of magneto-optic modulate frequency multiplication, and the variations of screwpitch, refractive index and birefringence with temperature of this kind cholesteric liquid crystal' are simulated by using its experimental specific rotation values. The simulated results are validated by experiment finally.