This paper proposes a load modeling method, based on transient recorded wave data. First import the recorded fault wave file, analyze the file data validity. Then load modeling for effective recorded wave file, identify load model parameters. Load modeling system can carry on the parameter identification of five kinds of load model, get the optimal load model, and through dynamic model test results verify the accuracy of load modeling method. Finally introduces the load modeling software simply, the software use QT programming, function is perfect, including basic information configuration, model identification, curve fitting, model validation, data export and other functions, and provide data interface with BPA.