Through an analysis of basalts distributed along the Dunhua-Mishan deep faulted zone of Muling-Jixi area and the reconstruction of paloevolcanic mechanism, the present paper Points out that ruby and sapphire are related to mottled alkaline olivine basalts that contain deep ultramafite xenoliths and xenocrysts.The paleovolcanic mechanism controls the distribution of basalts and, furthermore,the disfribution of ruby and sapphire secondary deposits.