The factor is named "gross profit margin growth spillover" to highlight its core meaning: the part of gross profit margin growth that exceeds revenue growth. A positive value indicates that the growth rate of gross profit is faster than the growth rate of operating income, reflecting that the profitability of the company has increased while the revenue has expanded, which may be due to factors such as improved product pricing ability, effective cost control, or optimized product structure; a negative value is the opposite, indicating that the growth rate of gross profit margin is slower than the growth of revenue, which may mean that the company is facing greater cost pressure or intensified market competition. This indicator helps investors identify companies with marginal improvements in profitability and further analyze their sustainability. Compared with a single gross profit growth or operating income growth indicator, this indicator can more effectively reflect the comprehensive changes in corporate profitability and operating efficiency, and is an effective supplementary indicator for judging the quality of corporate growth. In quantitative investment, this indicator can be used as an important part of the stock selection strategy to screen high-quality companies with profit growth potential.