Datuanliujia beryllium deposit in Rongcheng city occurs in Mesozoic syenogranite which is controlled by tension and contorted fault with the trend of NW. Beryllium element occurs in sericitization-kaolinization syenogranite as bertrandite single ore, and distributes in sericite as seperated type occurrence. Ore-forming has close relation with rich-alkalescence geotherm and calc alkali syeogranite, which belongs to middle temperature geothermal beryllium deposit, and formed in Mesozoic Yanshan period.