From the perspective of the heterogeneity of industries,this paper examines the effect of Dual Margins of Exporting on Labor Productivity. With the aid of UN Comtrade database,this paper calculates the Intensive Margin of Exporting and Extensive Margin of Exporting using HK index method. Further,this paper applies "cluster analysis" to distinguish the heterogeneity of industries considering a variety of factors. The empirical studies show that:In general,Chinese Intensive Margin of Export significantly promotes labor productivity,Extensive Margin of Export and labor productivity have a negative relationship. More importantly,the promoting effect between Intensive Margin of Export and labor productivity just exists in high-skill industries. Limited by technological content of products and labor skill levels of different industries,Intensive Margin of Export appears "immiserizing growth" in low-skill and middle-skill industries. There are various degrees of negative effects between Extensive Margin of Export and high,middle,low-skill industries.