Nowadays, the tourism an industry has its own complexities as the dynamic global and social phenomenon beyond as well as has become one of the largest and fastest growing industries. Health tourism is one of the areas of tourism that is more and more considered today. Health tourism is one of the most important forms of modern tourism. Therefore, effecting factors health tourism seems crucial and essential. Thus, in this paper, we have identified and ranked effecting factors on investment in health tourism. This research is applied in terms of purpose and descriptive-analytical in terms of method. The first population including health tourists visiting Iran for treatment during the year 2018 and the second population including health tourism specialists and experts and their numbers has been 350 and 43, respectively. In this research,(Strength, Weakness, Opportunity, Threat) SWOT model and Friedman test have been used to identify, classify and analyze the strategic factors of internal and external environment and to obtain important factor of each internal and external matrices factors.