本研究旨在探討線上美食外送系統進駐城市後對經濟及環境的影響。本研究首先以合成控制模型為第一個研究方法，以新北市為實驗組估計外送帶來的影響，樣本時間為2011年1月到2019年5月。第二個研究方法為合成固定效果模型，以全台除去連江縣之外的21個縣市為研究背景，樣本時間為2011年1月到2022年12月。實證結果發現:
(1)兩種模型的研究結果皆顯示在外送平台進駐該縣市後，一般垃圾有顯著的上升，代表不論是以新北市為研究背景或以全台21個線市為研究背景，線上美食外送系統皆對環境帶來負面的影響。
(2)廚餘量為唯一在兩種模型的研究結果中顯示出不同顯著程度的被解釋變數，而這樣的不一致可能是由於樣本時間的不同。
(3)在其餘所有環境及經濟被解釋變數的研究結果中，兩種模型皆顯示不顯著的結果。而這些被解釋變數包含資源回收量以及餐飲業營業額等。
總結本研究的所有結果可以發現，線上美食外送系統對環境的影響主要體現在一般垃圾的部分，對環境造成了明顯的危害，而造成這樣的結果的原因是由於台灣回收及垃圾處理的方法所導致。而在經濟方面，並沒有使餐飲業營業額有顯著的提升。

This study aims to explore the impact of the introduction of online food delivery systems on urban economies and the environment. The first research method utilized in this study is the Synthetic Control Model, with New Taipei City serving as the experimental group to estimate the effects brought by food delivery services, using a sample period from January 2011 to May 2019. The second research method is the Synthetic Fixed Effects Model, which examines 21 counties and cities in Taiwan, excluding Lienchiang County, with a sample period from January 2011 to December 2022. The empirical results reveal the following:
Summarizing the findings of this study, the impact of online food delivery systems on the environment is primarily reflected in the increase in general waste, which poses a significant environmental hazard. This outcome is likely due to Taiwan's methods of recycling and waste management. Economically, the introduction of online food delivery systems has not significantly boosted revenue in the food and beverage industry.

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