The invention relates to a decoding method for system information and equipment. The method is characterized in that: a special combination of four paths is decoded to obtain corresponding four-path system information and a locking indication; and a special combination of the four-path system information and the locking indication is selected to obtain system information, a locking indication andan inversed connection indication of an I/Q branch. By fusing the single carrier mode system information decoding and the multi-carrier mode system information decoding and judging the inversed connection of the data of the I and Q branches, the decoding method and the equipment ensure that the system information decoding result can be quickly obtained under the unknown carrier mode and the inversed connection of the I and Q branches, and enhance the adaptability and the response ability of a receiver.