The Complex of Sheikh Ahmad-e Jam tomb has been among the great works of Iranian architecture over time, one of the main areas of mysticism and Sufism in eastern Iran and the land of Khorasan. This importance has been due to the charismatic personality of Sheikh-e Jam and his descendants, who play an important role in the prosperity of these buildings, especially in the 8th / 14th century and towards the Ilkhanid era. Despite the historical status, many architectural values have been neglected in connection with mysticism. Among the monuments in the tomb of Sheikh Ahmed-e Jam, the structure of the old Jame Mosque (Atigh Mosque), which has been affected by the architectural works of the eighth century A.H, who was the founder of the"Khajeh Radhi-aldin Ahmad" ; but far enough studies on historical cognition , architectural typology and comprehensive studies have not been conducted on this construct. The purpose of this study is to survey the paradigms of architecture and the stylistics of the Old Jaame Mosque and its decorative elements and compare the data using documents and evidence regarding restoration and reconstruction of the elements, from the archaeological point of view. Also, to recognize the structural patterns and function of the structure at the time of construction and accuracy in chronology. This research is fundamental in terms of purpose and has been done using a descriptive, analytical and comparative approach to collect data from library studies, observation and analysis of evidence. The results of the examinations and research with the archaeological approach to the old Jame Mosque, using remaining reports and documents restoration of the work, contained valuable structural points, in terms of its typology and history, which showed that Jame mosque was constructed differently from other monuments of the of Sheikh-e Jam Complex and with several applications in the first half of the 8th /14th century and has undergone spatial changes over time.