The contract of preventing capital effusion not only affect optimized allocation of capitals, but weaken the agents' negotiation ability in preferential reciprocation contract and therefore hinder the utmost optimization of regional economy. While the agents' moral risk exists, the high amount of fine for breach of contract determined by the contract of preventing capital effusion will prevent the realization of utmost total utility of regional economy. The difference between internal capitals and external capitals should be eliminated, reasonable legal valid period of regional financing contract should be stipulated and powerful laws should be used to prevent the main parties of regional financing from forcing investors to sign contract of preventing capital effusion.