本文研究了我国特有、分布区极狭窄的一年生草本植物———杭州石荠苎（Ｍｏｓｌａｈａｎｇｃｈｏｗｅｎｓｉｓ）种群的密度制约规律。结果表明：在生长季内，种群的死亡率与密度密切相关。种群的最适密度为２００～１０００株／ｍ２左右。不同密度种群的平均株高、开花数等性状随时间的动态关系均符合“ｌｏｇｉｓｔｉｃ”模型。高密度种群中６０％左右的个体能完成生活史；低密度种群中８０％以上的个体能完成生活史。种群密度较高制约杭州石荠苎的植株形态和繁殖投资 In this paper, we study the density control law of Moslahangchowensis, an annual herbaceous plant with a very narrow distribution in China. The results showed that in the growing season, the population mortality and density are closely related. The optimum population density is about 200 ~ 1000 plants / m2. The average logarithm of plant height, flowering number and other characteristics of the population with different density were in accordance with the “logistic” model. About 60% of individuals in high-density populations are able to complete their life history; more than 80% of individuals in low-density populations are able to complete their life history. High population density restricts plant morphology and reproduction investment of Mosla in Hangzhou