Most of chaotic maps used in image encryption only could process squar e image.At the same time,they didn′t charge the image pixels′ value and were unable to resist known/chosen p laintext attack.This paper proposed a three-dimensional image encryption algorithm which completely destroyed the s tatistical characteristics of rectangle images using some new chaotic maps.It firstly split the plain rectang le image into eight layers according to pixel value.Then the layers were joined one by one and finally stretched to a new 8times bigger rectangle image.Secondly,it introduced some new chaotic maps utilizing a stretch-and-f old mechanism.A rectangle image was divided into three parts:two right triangles and one rectangle.In a part, each pixel could be inserted between two adjacent pixels of next column.So,the pixels were joined to a line which c ould be folded to a new cipher image.Repeating the above process,it could randomly shuffle positions of all p ixels of the new bigger image. Lastly,the processed image was combined to an original size cipher rectangle im age.In conclusion,the process could shuffle rapidly the positions of all pixels and change the values of all p ixels at the same time.Some simulations and analysis proved encryption approach could satisfy enough securit y requirements.In addition,the speed of the whole process was so fast that it was able to meet the requirements of real-time encryption.