On　account　of　the　poor　anti-nose　performance　and　the　complicated　calibration　process　in　the　existing　algorithms　of　the　vehicle　camera　self-calibration,　a　method　based　on　the　single　octagonal　template　is　proposed　in　this　paper.　This　method　takes　advantage　of　the　character　of　cross　ratio　and　the　harmonic　conjugate　in　the　projective　geometry　and　the　relevant　reasoning　of　Laguerre　theory.　With　this　method,　the　information　about　the　size,　locations　and　motion　states　of　the　template　isn＇t　needed　while　reducing　the　movement　times　of　the　template.　Meanwhile,　the　precision　of　the　corner　detection　can　reach　the　sub-pixel　via　improving　the　method　of　Harris　corner　detection.　A　large　number　of　experiments　proved　this　method　high-precision　and　effectiveness　while　giving　consideration　to　the　noise　and　other　factors　in　the　real　conditions.　©2010　IEEE.