The　beamtet　transform　is　an　efficient　tool　for　multiscale　analysis.　An　edge　detection　algorithm　is　proposed　based　on　beamtet　transform.　The　evaluation　of　this　algorithm　is　taken　from　several　aspects,　such　as　the　continuity　of　the　edge　detection,　the　antinoise　performance　and　so　on.　The　algorithm　is　applied　to　detect　edge　and　identify　lane　from　road　images.　The　experiments　show　that　the　continuity　of　edge　detection　is　good,　the　new　method　has　low　rate　of　wrong　detection　and　miss　detection,　which　also　has　good　performance　on　line　extraction.　But　the　performance　of　antinoise　is　inferior.　The　edge　we　gained　contains　information　on　the　position,　the　orientation　and　so　on,　which　will　be　convenient　for　the　target　recognition.　©;　2009　IEEE.