Abstract: According to the national standard,the Shanjiacun coal preparation draw up the determination methods of water content,magnetic material content and true density of magnetite powder,and illustrated the problems should attention in the process of operation. The result of data statistic shows that the determination methods used in Shanjiacun coal preparation plant has features of simple in operation,short time for testing,good repeatability and has certain rationality and reliability. The method has certain reference for other coal preparation plant to determine the quality of stored magnetite powder.