关键词: 乡村公路, 城乡收入差距, 农业劳动生产率, DEAMalmquist指数, 空间计量模型

Abstract: This article introduces rural roads construction into the twosector general equilibrium model，theoretically explaining the relationship among rural roads construction，agricultural labor productivity，and the urbanrural income gap. This paper constructs the spatial econometric model  and mediation effect model to empirically test the impact of rural road construction on the urbanrural income gap and its internal mechanism by using Chinas interprovincial panel data from 2002 to 2018. The study finds that the construction of the rural thirdgrade and fourthgrade roads has significantly reduced the regional urbanrural income gap. The construction of rural secondarygrade roads has a spatial spillover effect on surrounding areas，which means secondarygrade road construction is conducive to narrowing the gap in the surrounding regions. The mechanism analysis results show that the construction of rural roads promotes agricultural labor productivity by improving technical efficiency，reducing the gap between urban and rural areas. In addition，the rural roads construction has a heterogeneous impact on different regions. It significantly reduces the urbanrural income gap in the eastern region. But there is a siphon effect in the western region，thereby expanding the local urbanrural income gap.

Key words: rural roads construction, urbanrural income gap, agricultural labor productivity, DEAMalmquist index, spatial econometric model