Foreign tourists and tourism demand are very important in developing city tourism. Based on this, city planners and managers have always sought to measure tourism demand and identify the factors and categories that affect it and identify and prioritize these factors in order to make the planning based on each group and clusters of influential factors in the incoming tourists demand to Iran and to Tabriz. Tabriz city, with its diverse tourist attractions, is one of the destinations of tourism for foreign tourists. The necessity of optimal development of foreign tourism in Tabriz is to identify the factors affecting the demand of the city's foreign tourism toward clustering and prioritization. Therefore, the main objective of this research is to clustering the factors affecting the demand for foreign tourism in Tabriz for strategic planning purposes. To this aim, through library and field methods, set of factors influencing Tabriz tourism' demand has been identified and after evaluating the amount of these factors through foreign tourists entering the city, who were statistic sample from the Cochran formula in this study, was evaluated and finally, clustered and prioritized through the exploratory factor analysis model. The final results show the main effects of factors such as the quality of services in neighbor countries, the price of services in neighbor countries and the status of advertising situation about Iran in the source country, the proximity and cultural adjustment of the city with the source country and mental image and the activities of the agencies of the source country, have the most effect on foreign tourism demand in Tabriz city.