Abstract: Considering the code decoding complexity, low decoding rate, resource-intensive of LDPC,the decoding algorithm of LDPC codes is studied.The min-sum algorithm is simulated under Matlab, which is based on Additive White Gaussian Noise (AWGN) channel, and the best quantization scheme and the number of iterations are obtained. Then combining two improved min-sum algorithm, designs a new partly parallel LDPC code decoder is designed. The decoder has been realized on Xilinx's FPGA XC5VLX110T. According to timing sequence optimization, the decoder's throughput is up to 152 Mb/s.