现有文献多从宏观层面关注非正规部门的规模变化，很少关注其对微观企业行为的影响。本文利用世界银行营商环境调查数据，考察来自非正规部门的竞争对中国制造业企业创新投入、创新方式以及创新类型等决策的影响。实证结果表明：非正规部门竞争会倒逼企业增加创新投入，对企业的研发投入和研发强度均有显著的正向影响；从创新类型来看，新增的创新资源主要用于产品创新、技术升级以及提高个性化生产能力，对以改善产品质量和降低生产成本为核心的流程创新没有显著影响；从创新方式来看，非正规部门竞争会加剧企业之间的模仿创新和抑制企业的自主创新。政府需要规范非正规生产单位的灰色竞争行为，引导其从模仿生产向草根创新创业过渡。

Most of the existing literature focuses on the scale change of informal sector from the macro level, while few pay attention to its impact on micro-enterprise behavior. Using micro-econometric model and the World Bank’s Enterprise Survey data from a sample of China, our paper addresses this issue. We study the impact of competition from informal sectors on innovation behavior of competition against producers in the informal sector. The empirical results show that the competition has a significant positive impact on the R&D investment, both in quantity and in intensity, which means the competition from informal sector will promote the innovation investment of formal firms. In terms of innovation types, the added resources are mainly used for activities such as updating product, upgrading technology and improving capacity of personalized production. However, there is no significant evidence suggesting the influence of competition on process innovation, which is always aimed at improving product quality and reducing production cost. In terms of innovation modes, the competition from informal producers will obstruct the independent innovation and promote the imitation innovation. Our government needs to regulate the unfair competition behavior of informal producers, and guide them to transform from informal producers to entrepreneurial organizations.