With the rapid development of electronic products, it is crucial for designers and manufacturers to understand the lifespan information of new products before launching them on the market in order to provide high-quality products on a global scale. Therefore, life prediction has become a necessary procedure for manufacturers to evaluate the quality of their products. For high-power white LED, an efficient lifespan prediction method can not only shorten the reliability evaluation time of LED products, timely launch new products, and help manufacturers gain greater market share, but also provide users with clear understanding of product quality based on the reliability information provided by manufacturers, providing guidance for selecting appropriate products. Therefore, this article proposes a white LED lifespan prediction method based on covariance matrix. By studying its performance of lumen degradation and chromaticity shift, a mathematical model is established to help more accurately evaluate the lifespan of LED products.