In order to scientifically measure the effectiveness of information control in the information support of the river crossing project, an effectiveness evaluation method based on BP neural network is proposed. Focusing on the key nodes and expected targets of the information support task of the river crossing project, the index system for evaluating the efficiency of information control of the river crossing project is constructed. By using the characteristics of high nonlinear fitting accuracy and strong self-regulation function of neural network, the efficiency evaluation model of BP neural network is designed, and the model is verified and analyzed by simulation experiments. The results show that the model is applied to the evaluation sample of the information control ability of the river crossing project, and the effectiveness of the BP neural network in the evaluation of the information control efficiency of the river crossing project is verified.