This paper carried out feasibility experiment so as to check up wether the ground natural volcanic ash rock in Hotan region of Xinjiang can be used as concrete admixture.The experiment showed that the chemical and physical properties met the requirement of JG/T 315-2011 and DL/T 5273-2012;The grinding fine natural volcanic ash has inhibitory effect on aggregate alkali activity, its inhibition effect enhanced with the increase of dosage;When the ash mixed cement mortar in different dosage or combination, it has certain ash activity and the trend of gradually increasing the strength of cement mortar.The paper basically validated the feasibility that the grinding fine natural volcanic tuff in Hotan region of Xinjiang can be used as cement admixture of concrete,which can laid the foundation for its development and utilization.