The back propagation (BP) model of artificial neural networks (ANN) has many good qualities comparing with ordinary methods in land suitability evaluation. Through analyzing ordinary methods’ limit tions, some sticking points of BP model used in land evaluation, such as network structure, learning algorithm, etc., are discussed in detail, The land evaluation of Qionghai city is used as a case study. Fuzzy comprehensive assessment method was also employed in this evaluation for validating and comparing.