Innovation ecosystem is an important way for enterprises to break through the blockade of key core technologies and enhance their independent technological capabilities.It is of great significance to explore the construction and evolution of the core enterprise innovation ecosystem.Based on the modular perspective,a longitudinal single case study is carried on the realization mechanism of DJI's innovation ecosystem evolution from three aspects:context,structure and mechanism.The results show that product modularization,system modularization and platform modularization form the basis of enterprise innovation cooperation under the support of policy,technology and market situation.Driven by modularity,the realization mechanism,including the adaptation mechanism of innovation subject,the interaction mechanism of innovation resources and the symbiosis mechanism of innovation elements,has evolved gradually.Enabled by situational factors and modularity,the positioning of core enterprises has evolved from pioneer,dominant to leader,and the innovation ecosystem has evolved from chain,network to aggregate innovation network structure.Related enterprises should accurately grasp situational factors,effectively promote modular strategies,and continuously optimize innovation implementation mechanisms to promote the evolution of the innovation ecosystem.