Introduction Relevant programs of leisure time and tourism are considered as important economical, social and cultural phenomena. Nowadays tourism has been recognized as a cultural and economical activity in various communities. Some theorists believe that tourism is as a motive force for countries economic development. Regarding the importance of tourism, the major purpose of this research is to determine trust's position of foreign tourists to Iranians in development of tourism. In this research, the willingness of foreigner tourists to travell to Iran again? Is the objective index for measurement of tourism' s development.In order to achieve research's purposes, documentary methods including studying of background and theoretical principles of research and survey methods were used. Total population of the research subject, consist of foreigner tourists from five world's continents that have traveled to Iran with economic, social, political, scientific cultural, and recreational goals, 384 tourists were selected as sample size on the basis of choc ran formula...