As a kind of cyclic code, BCH code is applied widely in the communications. In this paper, it proposes a BCH code parameters estimation algorithm based on cyclotomic coset over finite fields. The proposed method achieves fast speed for the synchronization and the length of the BCH code estimation because it takes advantage of BCH code's characteristics that BCH is also a kind of Hamming code. The generator polynomial of BCH code is estimated accurately by using the cyclotomic coset theory. Simulation result...