Abstract-Emulsified　asphalts　are　popular　at　recent　years　for　saving　energy　to　melt　solid　asphalt.　Emulsifier　is　very　important　for　emulsification　of　asphalt.　Enzymatic　hydrolysis　lignin　modified　amine　(EHLA)　was　synthesized　by　Mannich　reaction　of　enzymatic　hydrolysis　lignin　(EHL)　with　formaldehyde　and　triethylene　tetramine　(TETA).　The　structures　of　the　product　was　analyzed　by　FT-IR,　and　the　influence　of　process　parameters　such　as　the　molar　ratio　of　formaldehyde　to　TETA,　the　reaction　temperature　and　time　were　discussed.　According　to　the　results,　the　optimized　technological　conditions　were　as　follows:　the　reaction　temperature　was　80　°C,　the　molar　ratio　of　formaldehyde　to　TETA　was　1.6:1,　reaction　time　was　3　h,　and　the　weight　of　lignin　was　25　g.　The　result　of　emulsification　shows　that　EHLA　could　be　an　effective　and　slow　set　cationic　asphalt　emulsifier.　©　2011　IEEE.