A method and system for establishing high-speed downlink shared channel, wherein the method comprises the following steps: RNC indicates Node B to establish high-speed downlink shared channel between the Node B and terminal; in response to the indication of the RNC, the Node B establishes high-speed downlink shared channel between the Node B and the terminal by using the preset high-speed downlink shared channel physical layer category; the terminal establishes radio resource control connection between the terminal and the RNC and returns information on the actual high-speed downlink shared channel physical layer category of the terminal to the RNC; and the RNC judges whether the actual high-speed downlink shared channel physical layer category of the terminal is identical with the preset high-speed downlink shared channel physical layer category, and if not, the RNC indicates the Node B to reestablish high-speed downlink shared channel between the Node B and the terminal by using the actual high-speed downlink shared channel physical layer category of the terminal.