In order to further improve the error-correction performance of the decoding algorithm for low density parity-check (LDPC) codes and accelerate the convergence speed of decoding, an improved decoding algorithm based on the interlaced column row message-passing was proposed. In the proposed decoding algorithm, the residual value idea in the dynamic scheduling strategy decoding algorithm was introduced into the serial scheduling strategy decoding algorithm so that the serial scheduling decoding algorithm performs an ordering calculation of the residual value before the message was updated in each iteration, and the original fixed update sequence of its node message was reordered. Simulation results show that the improved decoding algorithm, compared with the row message-passing decoding algorithm and the column message-passing decoding algorithm, can achieve 0.25 and 0.24dB net coding gain at the bit error rate of 10-4, and compared with the interlaced column row message-passing decoding algorithm, it can achieve 0.13dB net coding gain at the bit error rate of 10-5.