Abstract: Based on the mental recovery and adaptive behavior translation of the new urban migrants, a two system decision-making model for psychological adaption was built. The simulation research of psychosocial adaption process was studied through the stochastic catastrophe theory and the specific artificial social environment. Simulation experiments indicate that the sustained pressure-bearing suffers from outside situation and the policy system result in the fluctuation of migrants' psychosocial adaption with the former more significant. In the translation of adaptive psychology to adaptive behavior, the attitude orientation and psychological cognition of migrants are critical. The duration or degree of the adaptive process is influenced by outside pressure. The government must work out support measures according to the alerting area and control paths of psychological repellence. Once the opt-out of the cities are chosen by the urban new migrants, the extra policy costs have to be paid by the government to achieve the objective of migrants' reintegration.

Key words: new urban migrants, psychosocial adaption, cognitive level, simulation analysis of catastrophe