Mosque is the most significant body in Muslim architecture, and geometry and ornamentals are through the most important elements of the mosque architecture. In addition to the geometric role and beauty of mosque configuration, considering the mundain and spiritual aspects of mosques, it also conveys the meanings of Allah's beauty and gelorious names and attributes in the form of a physical configuration. This type of attitude towards geometry and ornamental decorations is recognized as semantic and virtue-oriented architecture. therefore, the main issue is the relationship between the geometry and ornamental decoration of the mosques with the quality improvement of the space of the nave of mosques. This relationship creates the necessity and importance of the geometry and ornamental decorations in architectural design of mosques at which the sprituality aspects must be considred in addition to the appearnce and mundain configuration. In this research, various methods such as document research libraray, Delphi, and case studies were utilized as well as the interview tools, questionnaires, surveys, and statistical analysis software. In order to collect the research-required information, some surveys interviews and questionnaires were conducted and distributed among the related experts within six historical and contemporary eminent mosques, and the data were analyzed using statistical softwares. Conclusively, in addition to improving the quality of the physical configuration, the results indicate that paying attention to geometry and ornamental decorations of mosques causes the increase in spritual manifestation of meaning and beauty in mosques.
