A　method　for　camera　calibration　based　on　orthogonal　vanishing　point　pair　is　proposed　to　improve　the　precision　and　flexibility　of　camera　calibration.　The　method　only　requires　camera　to　shoot　a　simple　self-designed　planar　calibration　pattern　for　a　few　(at　least　three)　different　unknown　views.　According　to　the　properties　of　vanishing　point　and　the　geometry　feature　of　the　planar　calibration　pattern,　two　geometry　constraints　can　be　found　between　orthogonal　vanishing　point　pair　and　calibration　matrix.　And　then　all　the　five　intrinsic　parameters　of　the　camera　can　be　recovered　linearly.　Both　computer　simulation　and　real　experiment　data　were　used　to　test　the　proposed　method.　Experimental　results　of　simulated　data　and　real　data　show　that　the　proposed　method　is　more　accurate　and　robust.