Bayon temple, Angkor Tom in Cambodia is one of the most significant monuments in Angkor monuments in terms of Khmer culture. The main tower of Bayon is 31 m high tower structure of sandstones by the dry masonry. The top area of main tower has a risk of collapses of constructed stones by proceeding of new cracks and joints between stones. Now, the repairs are severely damaged, and second repairing should be necessary. In this paper, we apply NMM-DDA, which is one of the numerical analysis techniques for discontinuous model using the principle of minimum total potential energy and penalty method. And, we conduct a numerical analysis of the top area of Bayon main tower to assess the safety level of masonry construction with the cracks. The analysis model of masonry construction and position of cracks is based on the measurement and drawings at the sites. In addition to the analysis, we also examined about the method of a new reinforcement by NMM-DDA.
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