Based on the implication of "3+5" urban agglomeration economy integration and its objectives and considering symbiosis theory of population ecology, this paper analyses the theory's applicability in "3+5" urban agglomeration economy integration. Taking all the participants as an organic population with complex relation, analyzing symbiosis unit, symbiosis mode , symbiosis environment and symbiosis interface , the author puts forward the operational mechanism of "3+5" urban agglomeration economy integration a...