92.57%。A method for estimating paddy yield on the basis of the fractal theory was proposed. The paddy variety was Wuyujing No 3. The image samples of mature paddy were obtained by the self-developed computer vision system. The fractal feature parameters of the images were analyzed. The linear correlation between the fractal dimension and per-square-meter yield of paddy was studied. The mathematical model was established and accuracy reached to 92.57%. 