Because of cloud computing’s high degree of polymerization calculation mode,it can’t give full play to the resources of the edge device such as computing,storage,etc.Fog computing can improve the resource utilization efficiency of the edge device,and solve the problem about service computing of the delay-sensitive applications.This paper researches on the framework of the fog computing,and adopts Cloud Atomization Technology to t physical nodes in different levels into virtual machine nodes.On this basis,this paper uses the graph partitioning theory to build the fog computing’s load balancing algorithm based on dynamic graph partitioning.The simulation results show that the framework of the fog computing after Cloud Atomization can build the system network flexibly,and dynamic load balancing mechanism can effectively configure system resources as well as reducing the consumption of node migration brought by system changes.