本文将出口学习效应拓展到绿色生产率领域，研究出口学习对绿色生产率的非线性影响。利用中国工业企业的微观数据，采用面板分位数模型和面板门限模型，研究出口对企业绿色生产率的非线性效应以及门槛特征。研究发现：出口对企业绿色生产率的影响为正，但该影响在不同分位点有显著性差异，具有非线性特征；同时，出口学习影响企业绿色生产率的非线性效应具有门槛特征，随着企业融资约束门槛值的降低，出口对绿色生产率效应基本呈现先增后减的库兹涅茨倒“U”型结构。本文的结果表明，企业出口可以提升企业的绿色生产率水平，出口学习效应存在；企业出口对其绿色生产率的影响是非线性的，具有门槛效应。

This paper extends the theory of learning-by-exporting effect to the field of green productivity, and studies the nonlinear effects of learning-by-exporting on enterprises’ green productivity. This paper explores the threshold effect of learning-by-exporting on green productivity through panel quantile regression and panel threshold regression model by using the data of China’s manufacturing enterprises. The results show that the effects of learning-by-exporting on green productivity are positive, and there are three thresholds effects of learning-by-exporting on green productivity. Learning-by-Exporting effect on green productivity show a typical Kuznets inverted "U-shaped curve which increases first and decreases then during both benchmark and robustness tests. This reflects the enterprises can improve their green productivity in a nonlinear mode through the learning-by-exporting effect.