Abstract: Based on Chinese dual labor market and market choice,this article has put forward an inflection supply model,an upward inflection curve of labor supply in dual labor market.On the one hand,laborers have more advantages in secondary labor markets than in major labor markets,one the other hand,“Lewis inflection point”has not appeared ahead of time,and the peasant-workers shortage is a normal fluctuation of peasant workers supply within this model.

Key words: dual economy, dual labor market, inflection supply model