In the process of investment negotiation, the investor and the enterprise have different opinions causing conflicts. Therefore, we need an objective standard to mitigate the conflicts between the investor and the enterprise, and need to make constant improvement to achieve a rational investment. Therefore, this paper presents an investment negotiation model which enables investment allocation regarding the core competences among companies. The presented model can mitigate the structure of conflicts between the investor and the enterprise considering idiosyncratic investment that is caused when the core competences is converted into power, and could be used in forming sustainable optimal alternatives in the process of dynamically changing negotiation.