Inspired　by　the　concept　of　conserving　resources,　bottom　ash　has　been　increasingly　utilized　in　road　construction　as　a　readily　available　waste　material.　This　study　sought　to　address　this　gap　by　quantifying　the　carbon　benefits　associated　with　bottom　ash　application.　Through　a　comprehensive　analysis　grounded　in　life　cycle　theory,　author　evaluated　the　changes　in　energy　consumption　and　carbon　emissions　before　and　after　the　integration　of　bottom　ash　into　the　road　construction　process.　The　analysis　employed　the　raw　material　production　stages　of　different　pavement　materials　as　the　system　boundary.　By　determining　the　optimal　amount　of　bottom　ash　and　calculating　the　associated　values,　the　study　proposed　an　efficient　application　scheme　for　utilizing　bottom　ash　in　urban　engineering　construction　projects.　The　results　showed　that　bottom　ash　had　the　least　carbon　reduction　effect　in　permeable　bricks,　followed　by　cement　concrete　and　cement　stabilized　macadam　mixture.　The　most　significant　effect　was　observed　in　asphalt　mixtures.　However,　energy　consumption　increased　with　the　addition　of　bottom　ash　in　asphalt　mixtures,　whereas　it　decreased　in　the　other　three　products.　The　carbon　reduction　after　applying　bottom　ash　was　predicted　based　on　the　annual　growth　rate　of　urban　road　construction.　Under　the　premise　of　maintaining　the　non-destructive　application　performance　of　asphalt　mixtures,　the　optimal　carbon　reduction　benefit　for　a　20%　addition　of　bottom　ash　was　approximately　17,369.9　tons.　In　cement　-stabilized　crushed　stone　mixtures,　the　optimal　carbon　reduction　benefit　ws　achieved　with　a　bottom　ash　content　of　30%,　approximately　15,797.7　tons.　The　practice　of　utilizing　bottom　ash　in　road　works　was　significant　in　terms　of　maximising　the　benefits　of　carbon　reduction.