在创新资源有限的前提下，企业选择低碳技术创新的必要条件是其收益大于其他类型的创新活动。本文在传统的A-J模型框架内，引入低碳技术创新的机会成本，系统分析了碳排放税、碳排放标准、减排补贴和碳排放许可四种环境政策工具对企业创新选择的影响。模型结果表明：每一种环境政策工具都存在一个最优水平，但其对企业低碳技术创新的激励效果和经济效益有所区别。通过对比分析发现，市场机制完善的环境政策工具更能促进企业选择低碳技术创新；而鼓励导向的环境政策工具更能促进企业创新活动的经济效益。本文研究结论可以为政府制定环境政策工具组合，提供理论指导。

Under the premise of limited enterprise innovation resources, the necessary condition for companies to innovate carbon technology is that its revenue is greater than other types of innovation activities. In this essay, author introduced low carbon technology innovation opportunity cost into traditional A-J model, system analyze the impact of carbon tax, carbon emission standards, emission reduction subsidies and carbon emissions permits four environmental policy instruments on the choice of enterprise innovation. The model result shows that each environmental policy tool has an optimal level, but each tool has a different incentive effect and economic benefit of low carbon technology innovation. Through the comparative analysis, environmental policy tools in more advanced market mechanism have a better effect in promote the enterprise to choose low carbon technology innovation, and encouraging oriented environmental policy tools can promote the economic benefits of enterprise innovation activities. The results of this paper can provide a theoretical guide for the government to develop environmental policy tools