It is emphasized that cooperation between the education and health sectors is very important to improve child health conditions through the advancement of school health in many developing countries. At the same time, improving children's health is very important for achievement of “Education For All" (EFA). Actually, this cooperation is very difficult to realize in many nations. However, in Lao P.D.R, establishment and implementation of a school health policy is by the cooperation of education and health sectors at a national level. This report aims to examine the reasons “Why it is going successfully?" hand, to give some information about how to develop international school health activities.Four points were examined as to reasons why this success was possible: 1) Lao P.D.R had much experience and knowledge about helminth-parasite control at schools. 2) From an early stage, both sectors cooperated, and the system was supported by international organizations, JICA, etc. 3) A new task force for school health was formed, because they did not have a position at both ministries. As well, it had a clear purpose of “establishment of school health". 4) When new task force became plan, school health was clearly located at the national level for the achievement of EFA and Millennium Development Goals (MDGs).Now, school health of Laos is still just beginning. The execution stage of the school health policy was thought to be important. For example, integration of the knowledge and experiences of each organization, strengthening the initiative of the Laos nation about school health, function of the ministry of education for school health, correspondence regarding geographical inequities, and race differences are considered to be important factors.