The operation modes of microgrid are researched and landscape theory is adopted in multi-microgrid systems to group microgrids in order to achieve better benefit. Complementarity of distributed energy resources is studied to define corresponding parameters in landscape theory, then landscape energy function is taken to group multi-microgrid. Based on the aggregation alignment of multi-microgrid, an optimization model considering interactive power fluctuation of PCC is proposed and the original values and the aggregation multi-microgrid energy optimal values are comparatively analyzed. The simulation result validates that the aggregation of microgrids increases individual economic benefit and enhances security of power system. So the validity and rationality of the application of landscape theory in multi-microgrid aggregation is proved.