The present disclosure provides a method for reducing information load of Packet Service Control Channel and a method for updating channelization code. The method for reducing information load of Packet Service Control Channel comprises the following steps: sending a service access request to a RNC by means of a UE; determining whether the service need to monitor HS-SCCH, and if the HS-SCCH is determined not to be monitored, configuring a transport block size index used when the UE does not need to monitor the HS-SCCH and transmitting the transport block size index to a BS, by means of a RNC; determining a channelization code of a High-Speed Physical Shared Channel according to the transport block size index, and sending the channelization code to the RNC, by means of the BS; transmitting the transport block size index and the channelization code to the UE by means of the RNC.