Ye Li's works show that China mathematicians have reached a high level in the research of higher-order equations (celestial magic). This northern mathematician, who was contemporary with Qin and Yang Hui, criticized the view that scholars regarded mathematics as a cheap skill at that time. When talking about the significance of mathematics, he said: "Predicate is difficult to be poor, but it can be; The forecast figures are not bad and impossible. In any case, in the dark, there is an inherent light. Those who show their husbands are naturally also. Unnatural numbers are also natural. " ("Circle the sea mirror? The number of nature reflects the principle of nature and is a correct understanding of the regular relationship between mathematics and natural things. In addition, he also pointed out that the relationship between numbers is "far and dry, looking like a ghost ... it can connect gods and follow life; If you are very young, you can run the world, like everything. "Ye's thoughts are worthy of the title of great mathematician.