Considering that nourishment of children starts from schools, body of schools must meet diverse expectations, needs, and activities of students. Fitting the space of schools should principally go through a functional, rather than merely theoretical, process in all its facets. Present research aims explaining the pattern language of spatial features of high schools and identifying classification criteria for these patterns. In spite of their different aims and heterogeneous patterns of establishment, many Tabriz high schools don’t meet the criteria of possessing an appropriate level of educational facilities. Therefore, looks for the pattern of spatial features of high schools in Tabriz. To answer the research questions, a mixed method of quantitative- qualitative was adopted. At the first step the spatial features of educational buildings in different scales– from macro scale (related to the city) to micro scale (quality of inner spaces) have been extracted. Then by the quantitative method, through field studies classified sampling in terms of demography and gender were done in the high schools of the city. Finally, by logical reasoning method, qualitative results achieved from the previous steps– which led to explain the pattern language of spatial features of Tabriz high schools- are presented. The results of the researches show that spatial features of Tabriz high schools consist of two physical and functional- behavioral patterns which are debatable at various scales and levels. Three pattern language characteristics included “community”, “scale/ hierarchy” and “compatibility/ continuity” can be recognizable in pattern language of spatial features of Tabriz high schools.