This paper is trying to estimate the impact of left-behind children on their father’s income and expenditure. This problem has an important impact on leftbehind children. In this paper, we got the conclusion by using IV method and the migration data of CHIP2013. According to the study, migrant workers who are more capable tend to make their children move with them, but the results become non-significant by considering the endogenous problems. And it is also found that the migrant workers, living with their children, will have more expenditure, especially in education and housing expenses.