We　present　a　novel　vision　servoing　method,　which　is　fit　for　climbing　robots　and　those　in　unstructured　environments,　based　on　texture　analysis.　A　large　textured　area　is　the　target　for　observation.　After　the　definition　of　texture　element　distribution　density,　the　relationship　between　the　change　of　the　density　at　some　selected　points　and　the　camera　pose　is　deduced.　The　vision　servoing　control　law,　which　meets　the　requirement　of　Lyapunov　stability　is　designed　in　this　paper.　Experiments　show　the　effectiveness　of　this　method.