The solubility of Pell equation Ax2-By2=-+1（A,B∈Z+,AB is a non-square positive integer) is a very meaningful question. In this paper, It is discussed about the positive integer solutions of Pell equation Ax2-By2=-+1（A,B∈Z+,AB is a non-square positive integer) by using the elementary method of Legendre symbol and property of congruence，it works out six conclusions to judge with the sets of Pell equation x2-Dy2=-+1（D is a non-square positive integer).