The stability of coefficients in DWT domain against JPEG-compression is analyzed.According to the conclusion,this paper proposes a novel image quantization watermarking algorithm in DWT domain for resisting JPEGcompression attack.The algorithm can extract watermark without using the original image.Experimental results show that the algorithm has fine transparency for the embedded watermark and is strongly robust against JPEG-compression attack,and the algorithm is also robust against other common image processing attacks,such as brightness adjusting,contrast adjusting,noise adding,resampling,dithering and smoothing.