The benefit of education first can be divided into that of investment and that of consumption. The benefit of investment involves market and money, a certain level of which can be measured by the difference of income between the laborer at this level of education and that at the next. However, the benefit of consumption doesn't involve market and money, but concerns the influence on the spiritual satisfaction, family life, economic sense and feelings, etc, of the educated and their family by education. Education still has a kind of benefit which is often forgotten——the external benefit, which means the benefit education brings to the members of society besides the educated and their family members, and doesn't involve market or money either.