The Preah Vihear monument in Cambodia, located close to the border with Thailand, was one of the Khmer temples registered on the UNESCO World Heritage List as a Cultural Property in 2008. It consists of masonry buildings constructed of siliceous sandstone blocks. In this study, the construction sequence of its buildings was inferred from the chemical composition, magnetic susceptibility, and size of the sandstone blocks, along with pediment end style, and the presence or absence of reliefs on the tympana of adjacent buildings. Five construction stages were identified. We revealed that the Western Annex Hall (N2) is the oldest edifice in the Preah Vihear monument. We also reconfirmed that the Preah Vihear monument was constructed over a range of years, spanning the Bakheng style period to the Angkor Wat style period (the end of the 9th century to the end of 12th century). It was clarified that during the construction of Preah Vihear, the style of pediment ends changed from pediments ending in scrolls made from one block, to pediments ending in scrolls made from two blocks, and finally to pediments ending in five-headed nagas. Over the same time span, the size of the sandstone blocks used in construction increased markedly.

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Based on the results of previous studies on planning methods and procedures of various Khmer monuments, we attempted to analyze the case of Beng Mealea. The construction measure is considered to be 411mm, however, dimensional inconsistencies are revealed in details of some parts. The objective of this paper is to examine the planning methods and process of Beng Mealea temple by a restorative approach.Judging from the result of analysis, the planning of Beng Mealea was started with double-enclosure temple layout, and subsequently developped, probably on the way of construction, to triple-enclosure. In consequence, we can see several

Remains of ancient monuments at Koh Ker and Angkor are equally important for study on the Khmer architecture. It is the same for analysis of its architectural planning technique reconstructively. In this paper, we would like to examine scale and layout of the temple monuments at Koh Ker, firstly through analysis of dimensional planning of Prasat Pram, a small and simple temple situated in the southern end of the city. The purpose of this study is not only to clarify the planning method which realized this temple proper, but to find an important clue for considering that used throughout the site.The results reconfirm the construction measure we proposed in the previous paper, as well as reveal the features of scale and layout of the Khmer temples in Koh Ker.Study on The Dimensional plan and The Planning method of Khmer architecture. No. 4

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