For computer software of low speed is not efficient in image encryption technology,a hardware encryption method based on FPGA is presented,the method is based on the password link model of image replacement algorithm and the improved Baker image scrambling algorithm. Only using less iteration ,we can change the encrypted image pixel change rate and the average change in intensity,also improve the ability of resisting differential attack of the encrypted image.%针对计算机软件图像加密技术中速度不高效率低下的问题，提出了一种基于FPGA的硬件加密方法，该方法基于密码链接模式的图像置换算法以及改进Baker图像置乱算法，只需采用少次迭代，就可以改变加密图像的像素改变率和一致平均改变强度，提高加密图像抵抗差分攻击的能力。
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