Abstract: The typical F5 steganographic method uses the standard quantization table with matrix coding method to embed information, so it has higher safety and smaller capacity. This paper presents a new method based on quantization table modification. By using the given quantization table and new embedding algorithm, the proposed method can avoid effectively the "shrinkage" phenomenon. The experimental results show that the present method, compared with the typical F5 steganographic method, not only greatly increases the steganography capacity and embedding efficiency, but also obtains the stego-image of higher quality and the property of anti-attack.