本试验探讨了不同类型甜菜品种在不同生育时期的光合特性，结果表明：在甜菜生育前期，高糖型品种的ＲｕＢＰ羧化酶活性较高，到生育中、后期丰产型品种的ＲｕＢＰ发化酶活性则表现较高的趋势；叶绿素含量亦呈这一趋势；在甜菜繁茂期丰产型品种的光合速率最高，糖分积累期高糖型品种光合速率高于其它处理；不同类型品种的光合速率每天中午均有降低现象，高糖型品种生育前期“午休”现象弱于其它类型品种。 In this experiment, the photosynthetic characteristics of different types of sugarbeet varieties at different growth stages were discussed. The results showed that RuBP carboxylase activity of high sugar varieties was high at the early stage of sugar beet growth, The chlorophyll content also showed the trend. The photosynthetic rate of high-yielding varieties was the highest during the period of sugarbeet flourishing, and the photosynthetic rate of high sugar-producing varieties was higher than other treatments in the period of sugar accumulation. The photosynthetic rate of different varieties was noon every day Both of them had the effect of reducing the phenomenon. The phenomenon of “lunch break” in early stage of high-sugar-type varieties was weaker than other types of varieties.