Data Integrality on whether Encouraging Export can Promotion Increasing of Enterprise Productivity

At the age of economic globalization,the exports have been valued by the enterprise more and more.The enterprise are encouraged to export in the classical trade theory,the improvement of the productivity from the exports has been totally stated in Melitz's Heterogeneity enterprise trade theory.But it is considered in the latest empirical study that the exports are not expected to promote but block the improvement effects on the enterprise productivity.Under such research background,in this article we analyse the status of the export enterprise productivity,using the fitures of the manufacturing enterprise(2000-2008) and the gross and averaging methods to calculating the enterprise productivity,and then testing the effects on productivity from the exports using two methods,it is considered in the conclusion that different export scale measure gauges lead to different conclusions:first,using the export-output ratio as the export scale,the exports block the productivity improvement;second,using natural logarithm of the export value as the export scale,the exports promote the productivity improvement.