The two-star pattern recognition method is researched on the small field of view provided that the sky-area to be observed is fixed. Firstly,the need is stated briefly.Then the pretreatment of the real-time star pattern is presented in short. Subsequently the pattern recognition algorithm used in the article is discussed in detail.And then the process to build the reference star catalog is explained.The simulation shows the algorithm is effective. The result is analyzed. Finally the conclusion is presented.