本文以马克思的地租理论为指导，在舍象绝对地租，并假定木材产品按社会生产价格销售，林业经营者具有完备的知识群和追逐最大化的利润目标，以及给出林业劣等地的经济学定义之后，研究了林地级差地租Ⅰ的计算步骤，文中举了一简化的例子 In this paper, Marx’s theory of rent as a guide, in Shexiang as an absolute rent, and assuming that timber products sold at social production prices, forestry operators have a complete knowledge base and chasing the maximization of the profit target, as well as given inferior forestry economics After the definition, the calculation steps of differential rent Ⅰ in forest land are studied, and a simplified example is given