To segment the complex target image, an algorithm based on integrated technology was proposed. First, the image was preprocessed to find the target area and have the image enhanced. Second, the target area was segmented by threshold and Canny operator, some raw results were acquired. Finally, in order to get the precise and complete target image, the optimizing process of the algorithm was made with morphological methods and logical calculation. Experimental results of field jujube leaf image showed that this algorithm was feasible and effective. This algorithm had a great advantage in complex leaf image which contains overlap leaves and uneven gray scale. The clear, smooth, precise edge image could be obtained.