Damage　to　semi-rigid　base　asphalt　pavement　is　related　to　improper　matching　of　the　pavement　structure　moduli.　This　study　mainly　focused　on　the　modulus　matching　of　structural　layers　and　the　development　of　a　pavement　structure　optimization　method.　First,　the　modulus　loss　of　existing　pavement　structures　was　analysed,　and　a　three-dimensional　finite　element　model　was　established　based　on　the　existing　pavement.　Second,　the　influence　of　the　modulus　of　each　structural　layer　on　the　mechanical　response　indicators　and　fatigue　life　was　analysed.　Based　on　the　results,　a　pavement　structure　design　method　using　the　smoothness　of　the　stress-strain　curve　as　the　modulus　matching　criterion　of　the　structural　layers　was　proposed.　And　it　was　found　that　a　strain　convex　point　was　present　and　that　the　stress　mutation　between　the　structural　layers　was　significant　when　the　modulus　matching　of　the　pavement　structure　was　reasonable.　Further,　the　evaluation　indicators　were　divided　into　two　groups,　namely,　mechanical　indicators　and　fatigue　life　indicators.　And　it　was　proposed　an　optimized　pavement　structure　design　method　based　on　modulus　matching　and　multi-indicator　range　analysis.　Finally,　the　optimal　modulus　combination　of　pavement　structure　was　determined　by　this　method.　The　research　systematically　studied　the　influence　of　the　modulus　of　each　structural　layer　on　the　mechanical　response　and　fatigue　life　of　the　pavement,　and　proposed　the　concept　and　specific　executive　criteria　of　modulus　matching　for　the　first　time.　Meanwhile,　it　also　provided　an　effective　optimization　method　for　pavement　structure　design.　©　2024　Periodical　Offices　of　Chang’an　University