Abstract: Based on a perspective of sector technology reclassification, the paper investigates the effects of public R&D investment in productivity of twenty two-digit China’s manufacturing sectors panel data during 1996-2009. Through calculating the productivity elasticity，the results suggest that there are significant productive effects during the sample period, a sector bias exists that public R&D has a greater effect on productivities of High-tech sectors than medium or low-tech sectors. Productivity increase in High-tech sectors mainly sources from R&D activities, while that of medium or low-tech sector mainly depends on material capital accumulation.

摘要： 基于部门技术水平重新划分的视角，运用1996 – 2009年间中国两位数行业代码分类的20个制造业部门的面板数据，实证分析了公共R&D在制造业部门间的生产率差异。在测算公共R&D总体弹性及其在高技术部门、非高技术部门生产率弹性基础上，研究发现：样本期内公共R&D资本对制造业部门生产率有显著促进作用，公共R&D效果具有部门偏向性，公共研发资本在高技术行业的生产率弹性远高于非高技术行业，高技术产业生产率的提高主要依赖于R&D活动，而中低技术产业的生产率提高更多依赖于物质资本的积累。

关键词: 公共R&D投资, 制造业部门, 生产率, public R&D investment, manufacturing sectors, productivity