The present invention discloses a channel access method and system. The channel access method includes the steps of: receiving an access request for accessing a parent channel from a user; obtaining a reception channel information currently corresponding to the parent channel in response to the access request, wherein the reception channel information is a channel identification information of a sub channel corresponding to a preset reception channel switching requirement; and connecting the user to the sub channel identified by the obtained reception channel information according to the obtained reception channel information. The present invention makes it conducive for the user requesting an access to be connected to a preset sub channel and realize user distribution.