Digital watermarking technology is the protection and authentication of this production through embedding specific meaning watermark, such as images, digital, random sequence in digital media. Based on the discrete wavelet transform( DWT ) algorithm original image is divided into Multiband which can be adapted to the characteristics of human vision and make the embedding and detection of the watermark can be divided into multiple. In order to make the best compromise between imperceptible and robustness, the watermarking is embedded in the mid-frequency sub-graph. The simulations reveal that the algorithm has better robustness and can resist attacks of image compression and noise.