本文基于Vishwasrao等人(2005)、黄静波和孙晓琴(2008)的两个模型,探讨了在引入对于发展中国家自主创新能力和专利保护强度的度量后南方国家福利的优化问题;论述了关税、专利保护强度的设定和进口产品技术含量之间的关系;证明了当发生技术进步时,南方国家的福利变化取决于本国的自主创新能力。 Based on two models of Vishwasrao et al. (2005), Huang Jingbo and Sun Xiaoqin (2008), this paper explores the optimization of the welfare of countries in the South after introducing the measure of independent innovation and patent protection in developing countries. The relationship between the intensity of patent protection and the technical content of imported products proves that when technological advances occur, the welfare changes in the South depend on the indigenous capability of independent innovation.