For image segmentation in which connectivity requirements are relatively high, region growing method has unique advantages. In the complex situtaion, that the computer can fast, completely and automatically select seed points is needed. Using two-dimensional OTSU pre-segmentation of the image can effectively solve the problem of seed points selection by using region growing image segmentation. Combined the image segmentation with petrochemical refining furnace tube, the feasibility and effectiveness of this method is discussed.