In　order　to　enhance　the　low　temperature　anti-crack　property　of　asphalt　mixture,　the　paper　adopts　silica　modified　material　to　study　the　low　temperature　anti-crack　property　for　asphalt　mixture.　By　indoor　tests,　it　is　proved　that　the　physical　property　of　penetration　and　softening　point　are　improved,　and　the　mechanical　property　of　compressing　strain　energy　and　bending　strain　energy　are　enhanced.　The　result　shows　that　silica　evidently　improves　low　temperature　anti-crack　property　of　asphalt　mixture.