Because the condition of communication in wireless sensor networks（WSNs） is complicated

in order to improve anti-interference performance between sensor nodes

adopt LDPC code technology in design of WSNs nodes.First design the basic structure and rules of WSNs node when using LDPC

and then design LDPC check matrix H according to this

compare three kinds of BP decoding algorithm

different code length and error rate curve of different iteration numbers.Through comparision of using the min-sum algorithm for decoding

code length is 128 bits and code rate is 1/2

the iteration the number is 30.The simulation results prove that after adding LDPC coding

although increase circuit complexity

but greatly improves reliability of communication between sensor nodes

and anti-interference performance of data communication in WSNs.