本文通过构建一个中间产品种类扩张型的内生技术进步模型，探讨了开放经济条件下人力资本、国内研发与国外研发技术外溢影响经济增长的内在机理。对模型的竞争性市场均衡分析的基本结论是：技术吸收能力的提高、人力资本积累有利于长期经济增长，然而贸易开放度、技术水平差距对稳态增长率的影响效应具有不确定性。进一步的实证检验利用1996～2002年间我国30个省市的经济数据，考察了分别以人力资本、贸易开放度衡量的技术吸收能力对经济增长的影响，同时比较了进口贸易、外商直接投资这两类传递渠道的技术外溢效果，并就分析结果提出政策建议。

应用元胞自动机的建模理论和方法研究国际技术创新扩散的复杂性。基于技术创新扩散的微观机制，建立一个创新扩散的随机元胞自动机模型，对不同初始状态、演化规则进行仿真分析，结果表明企业的内部研发对于整个经济系统长期的技术扩散和创新起到关键的若没有企业的内部研发，长期的技术扩散不会发生，技术创新率的均衡值趋零。

New growth theory and empirical study have shown that in-house R&D has the dual role, which not only generates new information, but also enhances the firm's ability to assimilate and exploit technology spillovers. Based on two faces of R&D we put forward a cellular automata model to investigate the complexity of the innovation diffusion of economic system in the long run. The simulation results show that the roles of in-house R&D and network externality on the average rate of innovators in the economic system own the characteristics of S-shaped curve. Increasing the level of in-house research may shorten the take-off phase of the economy and improve the stability of the long run level of innovation rate.

Potential conflicts between economic growth and environmental degradation are central to the sustainable development debate. In a Schumpeterian model of endogenous growth with vertical innovations, we introduce non-renewable resources which cause flow pollution problems. It examines the conditions under which sustainable growth is both feasible and optimal. We also perform some comparative static exercises to analyze the effects of parameter variations arising from the economic environment on the steady-state growth rate.