Abstract: Aiming at the selection of the best preventive maintenance strategy of asphalt pavement, combined with the preventive maintenance index and standard standard of asphalt pavement, the judgment standard of three-level preventive maintenance based on judgment index, comprehensive index and control index was established. Under this standard, taking the multi-year project-level maintenance planning as the research object, the preventive maintenance period was determined by combining the GM (1, 1) prediction model, and the multi-objective intelligent weighted grey target decision model was introduced to optimize the applicable preventive maintenance scheme. In this process, eight maintenance objectives such as maintenance cost and durability were determined, the weight was determined by the combination weighting method of game theory, and a section of G30 Lianhuo highway in Gansu Province was selected for decision analysis. Results show that the earliest time for preventive maintenance in this section is the third year, and it is not suitable to carry out preventive maintenance after the end of the 6th year. During this period of preventive maintenance, the comprehensive benefit value of scheme 4 is the highest, which is 0.735 8, that is, pre-maintenance measures of ultra-thin overlay should be taken in the fourth year. This method is simple and practical and can be a new method for the selection of preventive maintenance strategy of asphalt pavement.