Pruning is an important measure in begonia cultivation and management, which is closely related to soil, fertilizer, water, variety, density, pest control and other measures. Simply emphasizing pruning or ignoring the role of pruning is one-sided and cannot achieve good results. Only by well preventing and controlling soil, fertilizer, water, species, density and diseases and insect pests can we give full play to the regulating role of pruning and make Begonia grow and develop normally. The main functions of shaping and pruning of begonia are: improving the length and intensity of light time in begonia trees in North America, which has a great influence on begonia. Pruning and pruning can improve the light condition of seedlings, photosynthesis of seedlings, improve light condition and increase effective leaf area, and then increase photosynthesis of leaves and prolong light time through reasonable fertilization, which can increase the accumulation of photosynthetic products and be beneficial to flowering. For young trees and flourishing trees, measures such as light pruning, long planting of many branches, changing the extension direction of branches and adjusting the density of branches can effectively improve the light conditions of trees, enhance the photosynthetic efficiency of leaves, reduce ineffective consumption, increase the nutrient accumulation of seedlings and be beneficial to flower formation.