Using CES production function , the paper analyzes the reasons for the decrease of labor income share from 1995 to 2005 .The elasticity of substitution between capital and labor is less than one , labor augmenting technology is capital-biased, has negative impact on the labor income share , capital augmenting technology is labor -biased, has a positive impact on the labor income share , but the capital augmenting technology is gradually declining since 1995 .The increase in per capita capital is conducive to raising the labor income share .Labor and capital augmenting technology and per capita capital together produce the observed changes in the labor income share .The labor and capital augmenting technology have negative impact on labor income share, labor augmenting technology explains 64%of the decline of labor income share , the capital augmenting technology decline′s role in the second place .%本文运用替代弹性不变的生产函数，分析了我国1995-2005年劳动收入份额降低的原因：资本和劳动替代弹性小于1，劳动增进型技术是资本偏向的，对劳动收入份额有负向影响；资本增进型技术是劳动偏向的，对劳动收入份额有正向影响，但1995年以来资本增进型技术是逐渐下降的。人均资本的增加有利于劳动收入份额的提高。劳动和资本增进型技术以及人均资本共同作用产生了我们观察到的劳动收入份额变动趋势。在劳动和资本增进型技术对劳动收入份额下降所产生的影响中，劳动增进型技术解释了其中的64％，占主导作用，资本增进型技术的下降对劳动收入份额下降的作用次之。
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