Formulating and developing efficient immigrant policies are current necessities，given the State Immigration Administration of China is newly established. Some developed countries have accumulated more experience in immigrant policy making，but caveats remain. This article introduces a recent immigrant study（Cai and Winters 2017）to narrate this fact. This study uses data from American Community Survey to uncover a policy deficiency caused by an overlooked fact：the self-employment rate of foreign-born STEM college graduates，who benefit from pro-STEM policies，is significantly lower than their non-STEM counterparts. The raw difference is 3.3 percent. The empirical results imply that this difference can be partly explained by the different earning opportunities across college majors and employment types. An efficient immigrant policy should encourage efficient use of skilled labor，rather than advocate low-valued entrepreneurial activities. This conclusion can be generalized for our immigration policies making.