Abstract: A light guide plate and applied keypad thereof are provided. The light guide plate comprises a high transmittance plastic plate body (10). Multiple projections (12) formed by the light solidity colloid material are set on the upper surface (11) of the plastic plate body (10), and the printing ink layers (14) corresponding to the projections (12) seriatim and serving the function of the light guide are set on the undersurface (13) of the plastic plate body (10). By setting the projections (12) on the plastic plate body (10) of the light guide plate, the keypad using the light guide plate can make the projections (12) direct true to the projecting switches (31) of the cardinal plate (30) such that different forms of the key structures can be selected to match.