The research of “The study of lemon supply chain: a case study of Pasutara farm, Suan Phueng district, showing Ratchaburi was a qualitative research, and the objectives were: 1) to study and analyze the supply chain of agricultural products: lemons, in Suan Phueng district, Ratchaburi province and 2) to use as a guideline of supply chain management for agricultural products: lemons in Pasutara farm, Suan Phueng district, Ratchaburi province. The instruments used for data collection were observation, and in-depth interview of the administrator, and keymen of Pasautara farm, including data from secondary sources. The qualitative analysis tools were content analysis, value chain analysis, SWOT analysis on the lemon supply chain in Pasutara farm.

The research results revealed that agricultures in Suan Phueng district used their production factors; cutting-branch, from the provinces nearby such as Phetchaburi, Nakhon Pathom and Suphanburi. Popular varieties grown were Eureka, Lisbon Meyer and Assamese that they used the lemon branches from cutting and cleft grafting. The most popular lemon products were fresh lemons. However, the analysis results show that there are chances for agricultures and start-ups, who are interested in growing lemon by using SWOT analysis, as the guideline and plan to develop supply chain management of lemon, by following Pasutara farm’s structure. Moreover, the result of the value chain, supply chain management and SWOT in this research would guide lemon farmers in Ratchaburi, and the owner of Pasutara farm on how to reduce their costs and times, and improve for the more capital-intensive production process, after learning from each stream in the value chain.