Abstract: Through the analysis the work of constructive algorithm and nappe neural networks，the constructive algorithm for training nappe neural network ensembles is proposed.The proposed method constructs the ensembles automatically.So it improves the accuracy of the individual networks while increasing the diversity among the individual networks.And this method helps the users with little experience in using neural networks to design the ensembles architecture.Compared with standard ensembles in solving several problems this methods with excellent performance.