Dengue virus has always been an important public health problem in Thailand. Dengue virus is a contagious disease carried by Aedes mosquitoes, causing loss of life, medical care and the loss of the country's economy. This disease tends to spread during the rainy season. Therefore, Siam Service and Consultancy Co., Ltd. is aware of the health of employees and prevent dengue fever, with the cooperation of Chao Phraya Surasak City Municipality, Sriracha, Chonburi have come to spray and clear up mosquitoes also breeding grounds, the main problem of spreading dengue fever. In addition, surveillance of mosquito larvae breeding sites is also monitored. Sand abate was added to all sources of consumption water.