Provided are a code channel selection method and device, which can increase the uplink transmission efficiency during an operation where a variable bandwidth is set to zero. The method comprises: acquiring a bandwidth contraction-expansion factor and the bit number of a first sequence of channel coding; according to the bandwidth contraction-expansion factor, the bit number of the first sequence of the channel coding and a pre-set first set, determining the first bit number of a second sequence, wherein the second sequence is an output sequence after rate matching is conducted on the first sequence of the channel coding according to the bandwidth contraction-expansion factor; according to the first bit number of the second sequence, acquiring first information about the second sequence, wherein the first information comprises a first spectrum spreading factor of each code channel in at least one physical channel code channel corresponding to the second sequence; and according to the first spectrum spreading factor of each code channel and the bandwidth contraction-expansion factor, determining a spectrum spreading code corresponding to each code channel. The present invention is applied to the field of communications.