Abstract:The prediction of highway roadbed settlement amount is not only related to the highway construction quality and level of service, but also has an important impact on highway traffic safety at the same time. According to the measured data of roadbed settlement, a variety of gray prediction model were applied to analysis the data law and compare accuracy, the optimal gray prediction model was selected to predict the roadbed final settlement amount. Providing a reference for the evaluation of the roadbed stability and controlling to roadbed settlement.