In the medium and short code lengths

the performance of the polar code without Cyclic Redundancy Check（CRC） assistance is not competitive. In order to increase the decoding performance of the polarization code

CRC assisted decoding is generally used. For the traditional centralized CRC auxiliary scheme

the path can only be selected after the end of decoding and cannot be pruned in the decoding. This paper proposes an auxiliary decoding scheme for discretely allocating CRC bits between the bits of the polar code information through the interleaver. The scheme allows the CRC bits to assist in the selection of survivor paths during Successive Cancellation List（SCL） decoding process to improve the error performance. Simulation results show that compared with the centralized CRC-assisted decoding scheme. Simulation results show that compared with the centralized CRC-assisted decoding scheme

when the code rate is 0.125、block error rate is 10

-1

the algorithm provides 0.5 and 1.3 dB gain while the length of CRC is 8 and 16 bits respectively.