The controller research for a kind of nonholonomic mobile robot with uncertain camera parameters is investigated in this paper. We firstly present an uncertain model of nonholonomic kinematic system of type (1,2) mobile robot based on the visual feedback, the state and input transformations, which is a kind of chained form with uncertainty. Then, a kind of linear feedback controller is proposed which can not stabilize the nonholonomic uncertain chained systems exponentially. This conclusion is proved rigorously.