Abstract: Digital watermark is disturbed by channels noise in the course of transmission，while irregular LDPC code has strong error correcting capability.This paper combines irregular LDPC code and digital watermark technology，first，encoding the digital watermark with irregular LDPC code，second，presenting a wavelet transform and Singular Value Decomposition（SVD） to the host image，at last，embedding the watermark in the host image.Analysis and experimental results show that the new watermarking method reduces the error probability，performs well in both invisibility and robustness.