Abstract: Intergenerational income mobility can reflect the influence of the parent income on the income of their offspring, so it is an important indicator in measuring opportunity fairness. The results of this study show that the intergenerational income mobility is significantly different in China’s different ownership sections. The parents working in Party and government offices, public institutions, SOEs and other sectors within the system have biggest impact on the income of their offspring, followed by those working in the private enterprises, foreign-funded enterprises, self-employed and other sectors outside of the system; while those working in the collective economic sectors have the least impact on their offspring. The contribution of the individual characteristic differences of the offspring to the offspring income gap between the sectors outside of the system and the collective economic sectors is more than 65%，while to the offspring income gap between the sectors within the system and the two other sectors is only less than 50%. Meanwhile, the contribution of the degree difference and the individual characteristics of the intergenerational income mobility to the income gap has different expressions at different positions of the offspring income distribution.

Key words: intergenerational income mobility; sectors of different ownerships; income decomposition