Abstract: Besides the transmission congestion reflecting the physical stability of a power system,power market and social welfare are also constrained by factors like primary energy,emissions,technical support and multi-game.The factors affecting both competition level and efficiency of a power market can be called by a generic term as generalized congestions,which will act together to constrain the operations of both power system and power market.Among these factors,the obstructed energy flow caused by emission constraint can be called emission congestion,which has brought up more and more attention.Emission congestion and transmission dynamic congestion are compared through aspects like mechanism,characteristics and time frame.Based on dynamic simulation platform for power market ＆ power system（DSPMPS）,the mutual influences between the two congestions are studied.Simulation results show the complex mutual influences between the two congestions and it suggestes to optimize the risk management of generalized congestion from the gloabal opinons,At the system operation aspect,it is suggested to manage two congestions comprehensively by adopting the risk allocation method of ’allocate different congestion risk according to the corresponding congestion mechanism’.