For practical application in the design of fractal graphics demanded in clothing design, a method of automatically extracting core basic pattern and generating quadrangle continuous patterns is put forward based on fractal graphics content. The method first uses the Canny operator for edge detection, analyzes the region of the main pattern, and then extracts and analyzes the texture features using the gray level co-occurrence matrix. On this basis, the optimal stitching method is selected to splicing the extracted patterns to generate a square continuous pattern. This method produces a square continuous pattern with beautiful appearance, low computational complexity, strong universality, and sound practicability.