We present a mixed oligopoly model for private banks and a public bank with mixed ownership and policy burden to research the program of strategic investor importing for state-owned banks. We find that close relationships exist among the equilibrium equity structure following strategic investor importing, the policy burden of state-owned banks and the number of private banks; that the policy burden of state-owned banks has positive relationships with the performance of private banks, with overall negative effect on social welfare; that the policy burden would not affect the maximum market capacity number of private banks but would affect the equity structure of state-owned banks with such a number.