应用１４Ｃ示踪技术，结合常规方法研究了耐密型玉米光合速率与产量的关系。结果表明，玉米光合速率，密植型和普通型之间没有显著差异。光合速率日变化，在８时至１６时较高，为５０～７０ｍｇＣＯ２／ｄｍ２·ｈ。穗位叶的光合产物，经７２小时运转，有８０％输送给其它组织器官。耐密型玉米能耐密植，提高了单位面积的株穗数，从而获得了较高的产量。 The relationship between photosynthetic rate and yield of confined maize was studied by 14C tracing technique and conventional method. The results showed that there was no significant difference between maize photosynthesis rate, close planting type and common type. The diurnal changes of photosynthetic rate were higher at 8 o’clock to 16 o’clock and were 50-70 mgCO2 / dm2 · h. Spike leaf photosynthetic products, after 72 hours of operation, 80% to other tissues and organs. Density-tolerant corn is able to tolerate close planting and increase the number of panicles per unit area, resulting in higher yields.