Based on Michael Sherraden's theory, this study expounded the origin, assumptions and limits of assets-building policy. It pointed out that the assets-building policy was originated from the “Forty Acres and A Mule” during the Civil War in the middle of 19th century. The causes of revival included the social development strategy of the underclass self-destructive character meeting the American values, accumulation of assets conducive to national capital and international competitiveness, and support from the left and right wings and international organizations, besides public accessibility and practicability. However, in practice, this policy inclined to blamed the poor and ignored the inequitable social structure. It expanded the psychological, social, and political effects of assets, but still needed more evidences. And the execution of the policy required corresponding measures. All of those created limitations to the policy. However, instead of focusing on individuals as in the past, it concerned about the household and social participation, as well as character-building and capacity-developing, which is worth noting.