A differential game model has been utilised in this paper to analyse the dynamic strategic problems of online advertising in a two-echelon supply chain. First, the level of spillover effects has been introduced to examine the impact of different types of online advertising. Second, based on the improved Lanchester model, a dynamic investment decision model for online advertising has been developed. The results of the simulation describe the market share, online advertising investment amount and profit changes over time. Finally, by using the Ru...