Look-up table star tracker system was designed in this paper. Therefore, the star database construction, star matching, and attitude identification algorithms were proposed for Look-up table Star tracker. Star database construction algorithm construct a look-up table type star database, and the star database searching speed is faster compared with other algorithms. Star matching algorithm match the right guide star, and it has the advantage of high success match rate and no wrong match according to the verification of the star simulator. Attitude identification algorithm calculate the Star tracker camera attitude from the guide star information, and the accuracy was proved by the star simulator.