There are several kinds of risks among bank, Real estate developer and assessment agency in mortgage loan of construction in progress. The risks were respectively analyzed theoretically by the game models based on the experience inductive of reverse selection between bank and assessment agency and moral hazard between bank and real estate developer. Conclusion can be according to the models drawn as following: long-term cooperation should be introduced between bank and assessment agency, D/V should be appropriately set by bank and hence the optimal strategy of bank should be to launch loan.