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To these lacks of image encryption of current 3D chaotic map such as low security, low encryption speed and small key space, the fast scrambling method was designed in this paper, and the mixing and diffusion mechanism were simultaneously introduced into this algorithm to propose the image encryption algorithm based on the fast scrambling integration with 3D chaotic map to strengthen the security of the algorithm for well overcoming above defects. Firstly, the fast scrambling method was used to permute the initial image to change the position of pixel; the initial external key was obtained by 3D Chen system with transform function of pixel value to confuse the pixel of the permutation image under the mixing mechanism; changing the initial external key , the 3D chaotic map was iterated again to get a three triple 1D pseudo-random array, and the key stream mechanism was used to quantity the array to get one new array, using the new array to diffusion the confused pixel. Using Core Duo 3.5 GH PC machine with dual-core CPU and MATLAB simulation platform, inputting 256*256 pixel image experiments expressly, it uses 78.67 s scrambling 100 times, its relevance is -0.001 652 in the gray plane about, The results showed that:this image encryption algorithm has a good encryption property such as highly secure, huge key space, and fast encryption speed. 