The macro facts of China urban and rural that the convergence of farmer's wage income and industrial difference are narrowing between regions, the trend of urban-rural income gap is the same as the share of rural per capital wage income in all regions, show that the labor force by "foot vote" will flow to the areas with smaller income gap. This research elaborates the causal relationship between labor mobility, rural per capital wage income and urban-rural income gap, and establishes simultaneous equations using 1990-2012 China provincial panel data, The results conclude:There exists inverted "U" shaped relationship between rural per capital income wage and rural average education. Labor mobility is an important way to increase rural per capita wage income and the proportion, and increasing the share of the rural per capital wage income in all regions is important to change the spatial pattern of urban-rural income gap. Therefore, for the population inflow region, larger urban-rural income gap can narrow local income gap by attracting more migrant labor; for the population outflow region, larger urban-rural income gap can narrow local income gap by adding more migrant labor to increase rural per capital wage income. However, from the viewpoint of regional proportion of rural per capital wage income in the region where the population flow in, the population inflow region form such vicious circle "lager income gap-lower proportion of rural per capital wage income-larger income gap". Finally, from the perspective of rural labor mobility, the paper attributes the spatial patterns of urban-rural income gap remains unchanged to the facts that labor mobility brings rural per capital wage income in the population inflow region more than the population outflow region, and also the urban-rural income gap in the population region narrowing more than the population outflow region.