Abstract: At present, there has been a lot of debates among scholars about the theory of Lewis Turning Point in China. In all, the root causes for this are as follows: first, the two implications of the theory itself the first turning point and the second turning point; second, the two different judgment methods wages and marginal productivity. We should answer the two questions: one is whether the supply of labor is unlimited, the other is whether we have agricultural crisis with the further labor migration.