中文摘要：

前沿研究关注环境规制对技术进步的激励作用，却普遍忽视环境规制与技术进步方向转变的非一致性。文章构建二阶段模型演绎环境规制与技术进步方向的作用机制，检验我国环境规制与技术进步方向关系、环境规制陷阱的存在性及技术进步方向转变的效果。研究表明：（1）环境规制存在陷阱，环境规制强度和清洁技术研发并非同向变化，仅当清洁技术创新满足激励相容约束时环境政策才能有效激发清洁技术研发。（2）环境规制与清洁技术吻合厚左U形关系，出现非同步性效应且多数地区处于U形左侧阶段。而这类环境规制与清洁技术创新的非同步性源于技术进步方向转变的门槛效应，只有当经济发展水平达到临界状态时，政策管制才可能转变技术进步方向，提升环境质量。

英文摘要：

Frontier Literature focuses on the incentive role of environmental regulation in technologi- cal progress,but generally ignores the inconsistency between environmental regulation and directed tech- nical change.This paper constructs a two-stage model to deduct the role of environmental regulation in di- rected technical change, and tests the relationship between environmental regulation and directed techni- cal change,the existence of environmental regulation trap and its effect on directed technical change. It comes to the results as follows：firstly, there is a trap in environmental regulation, namely changes in en- vironmental regulation intensity are inconsistent with ones in clean technology innovatioa, and environ- mental policy can effectively stimulate clean technology R＆D only when clean technology innovation meets the incentive compatibility constraints; secondly, there is a thick left U-shape between environmen- tal regulation and clean technology, which is featured by asynchronous effect, and most areas are located in the left side of the U-shape curve.The inconsistency between environmental regulation and clean tech- nology innovation derives from the threshold effect of directed technical change;only when the economic development level crosses the threshold value, policy control may lead to directed technical change, thereby improving environmental quality.