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The Journal of the Royal Institute of Thailand Abstract Phra Phuddhajaoluang (King Rama V) and His Works on Trees and Sceneries: a Personal Journal Given to Chaophraya Vorabhongse Bhibat Decha Boonkham Associate Fellow of The Academy of Arts, The Royal Institute, Thailand Besides, his great achievement on modernizing Thailand in the last century, King Rama V had much interested in urban development, landscape architecture and street tree planting. His memo issued to many of his subordinates proved he had deep knowledge and practices in the subjects. This article excerpts from the memos issued and practical knowledge of plants, trees and landscape. The memos also demonstrated his interest and knowledge in street and road layout, urban development and sanitary. for maintenance as well. In the last few years of his rein, he bought a plot of land in Petchburi for rainy season palace due to his physician recommendation to avoid humidity in Bangkok. Even though, His Majesty still paid much attention on planting and landscaping of his new palace including means for transportation of his fruit trees from Bangkok. Keywords : King Rama V, King Rama V’s activities, street trees in King Rama rien, Urban development, Dusit Palace, original street names in the Dusit Palace,