The developing of Metropolis is facing the same obstacles as the developing of computer science.For example,Dual Core Processors give solutions to the bottleneck of single core in computer science.And In metropolis,especially in Jing-Jin-Ji,the strategy of single economic pole is confronted with many rigid restrictions.So the paper raises the idea of constructing dual-core economy center.It is the request of Resources Targeting,Scale Economy and Organic Decentralization theories.Furthermore,the paper analyses the bases and necessity to carry out the Dual Core economic center plan in Jing-Jin-Ji,and gives some advices to the task division and contact between the Dual Core,using the Dual Core Processors in computer for reference and tries to give some suggestions for Jing-Jin-Ji Metropolis.