Abstract: With the fast economic development, the traditional growth pattern of physical capital investment-led economy needs to be changed. While human capital and social capital as an endogenous variables of economic growth have attracted more and more attention. Based on the theory of capital investment and using the migrant worker survey data,this study applied the Logistic model to analyze the main influencing factors of investments on both individual human capital and social capital. Results showed that 1) the direct wage income is a major factor affecting the investments on both human capital and social capital. The wage income coefficient is 0.5, meaning the investment of migrant workers increases by 0.5 units with 1 unit of wage income increase; 2) the future plans of migrant workers have a significant influence on investment behaviors of migrant workers and those who plan to go back to rural area in the future tend to invest more; and 3) human capital endowment, gender, and life cycle of migrant workers also have remarkable impacts on human capital investment, but less impacts on social capital investment. The study also found that migrant workers exhibit rational behaviors on human capital investment and will find the optimal balance between investment and expected outcome. However, migrant workers are pretty weak for the cognition and behavioral decisions on the social capital investment.