本研究主要在探討外送平台對餐飲業者帶來的影響。由於當今社會很多消費者都相當依賴外送平台消費，尤其在餐飲業情況更是明顯。當外送平台制定3成訂單佣金而壓縮餐飲業利潤時，餐飲業者卻還是趨之若鶩，加入外送平台以爭取訂單與銷售量。為了解外送平台對餐飲業者定價與利潤的影響，本研究以三人不合作賽局，設定一個有兩家餐飲業者和一家外送平台的餐飲市場，然後導入垂直策略替代特性的需求函數，以mathematica軟體求解均衡，探討業者加入外送平台的因應策略與優劣，以呼應實際社會外送平台攻略餐飲市場的現況。研究結果發現，餐飲產品替代性愈高，店面與外送訂單的訂價愈低，銷售量愈高，所有業者的利潤也愈低。而轉嫁成數愈高，不影響店面價格，但外送平台訂單價格愈高，外送量減少，店面銷售量增加，所有通路業者獲利減少；若外送訂單佣金愈高，餐飲業者利潤下降，外送平台利潤上升。當有外溢效果產生新的需求時，餐飲業者與外送平台獲利均上升。

This paper discusses the impact of delivery platforms on catering industry. Consumers today rely on delivery platforms for consumption so much, especially in the catering industry. When the delivery platform ask 30% order commission and that reduce the profit of the catering industry, the catering industry still rushed to join the delivery platform to get more sales. In order to understand the impact of delivery platforms on the pricing and profits of catering sellers, this paper uses a three-person non-cooperative game to set up a catering market with two catering sellers and one delivery platform. And solve the equilibrium with mathematica software when introduces the demand function with vertical strategies. Finally, we find the corresponding strategies and the impact for the sellers to join the delivery platform and the results echo the actual society in the catering market. The results of the study found that the higher the substitution of catering products, the lower the price of store and delivery orders, the higher the sales volume, and the lower the profits of all businesses. The higher the pass-through rate, the higher the price of the store, but the higher the order price of the delivery platform, the lower the delivery volume, the increase in store sales, and the profit of all channel businesses will decrease; if the commission for delivery orders is higher, the profits of the catering industry will decrease, profits of delivery platforms rose. When there is a spillover effect that generates new demand, the profits of the catering industry and the delivery platform both increase.