Environmental protection information management and electromagnetic environment parameter prediction analysis system is developed to manage a large mount of relevant information of transmission project and provide theoretical basis for the power of decision-maker, managers, designer, scientific research personnel. The constructing and realizing of management system and using matlab tools for building electromagnetic environmental parameter prediction model are described in details, through the system integration complete the development of the system of information management and prediction analysis model, then support the decision-making of Grid environment protection. Finally, Matlab Neural Network(NN) toolbox could be called by C#.NET successfully,forecast analysis is achieved for the audible noise of transmission line.