This paper is based on the exponential smoothing model to enhance the abilities of watercolor students and achieve their stylized watercolor creation. Firstly, the system is structured from the predicted value of the smoothing index. The sum of weights is calculated for each coefficient, and the quadratic, exponential smoothing model is modified. The design of the watercolor teaching system based on the quadratic, exponential model was completed after analyzing the components of the teaching model. Finally, a comparison experiment was conducted to verify that the overall performance of students was improved, and the final test score of painting reached 69%, which was significantly improved relative to that of the control class. The students in the experimental class were also tested for their T-values, and the test results were all below the significance level. It indicates that after the systematic teaching designed in this paper, the watercolor students' watercolor skill ability, personal stylization, and watercolor creation ability have a positive enhancement effect.