Since the mid-1990s，the central government has formulated a series of fiscal supply policies concerning compulsory education for migrant children，which leads to the situation that county-level governments in inflow areas undertake the major obligation of supporting migrant children’s education. The mismatch between interests，obligation and capability of county governments restricts migrant children’s opportunity of receiving compulsory education. To protect migrant children’s legal right of receiving quality free education，this article proposes to establish a fiscal supply mechanism that the inflow provincial governments take the major obligation，while governments at all levels share the fiscal supply together.