For a long time, there has been a significant vacuum in the supply of lumber in China. In order to alleviate the contradiction between wood supply and demand and to increase the outturn rate of wood products blank. This study employs pine sawn timber as the research object and uses the dimensional specifications and defect conditions measured in the field to construct a sawn timber register. According to the measured data, the experimental scheme of regression analysis was designed and the simulated sawing experiment of pine sawn timber was completed. The regression equation of the outturn rate about basic blank and short blank was established by regression analysis for experiment results and the law of the impact of the factors on output indicators was determined. The results showed that the quality of sawn timber and the requirement for the quality of blank were the most important factors affecting the outturn rate of wood products blank. With the improvement of the quality of sawn timber and the decrease of the quality requirement for the quality of blank, the outturn rate of total blank will increase by more than 12%. A new idea of using the relative area of sawing surface defects to divide the sawn timber grades was proposed, and the corresponding relationship between the sawn timber grades and the production process of high-quality blanks was established, which provided basic theoretical support for optimizing the development of sawing equipment.