Abstract: The Gaobanhe Mesoprotemzoic polymetallic sulfide deposits in East Hebei were deposited conformably on Mesoprotemzoic dolostone and black shales．Many types of pyritic stromatolites are distributed in polymetallic sulfide deposits in the form of bioherm．Pyritic stromatolites were studied by analyzing the ultrastructural morphologic characteristics and Laser Raman Specteoscopy．It is found that primary biogenic structure is preserved with pyritic stromatolites．They existed in a littoral environment．Thermophiles were flourishing in a reduced environment．which is quite close to the vents of hot water on seabed．They absorbed and enriched minerogenetic elements，reduced mineral materials from the vents, readjusted them biochemically and eventually formed pyritic stromatolites．