Neural networks application in helicopter reliability researching is introduced in this paper. Because of high cost and long collected time, the collecting of helicopter reliability data is difficult, so it is difficult to establish the reliability data distribution model, predict the reliability and allocate the reliability of helicopter. By using the neural networks, the reliability data of helicopter is extended. The reliability data distribution model can be established, the reliability prediction can also be done accurately. It is proved by the instance that the reliability prediction accuracy is improved 98.4% by using the fuzzy neural networks. The application of neural networks has a good reference to helicopter reliability researching.