Abstract:The beneficial metal elements such as Fe，Ca，Zn，Cu，Mn，Li，Ni，Cr，Na in potato，wheat flour，corn flour，rice and millet from markets of Yantai were tested and the detection results by using two digestion methods and the contents of these beneficial metal elements in these crops were compared. It turned out that there was no significant difference （P>0.05） on the results by using conventional Dry-ash method and simplification of Dryash method and that the recovery and the precision of these two methods were both up to the requirement. The 9 kinds of beneficial metal elements in the 5 kinds of crops were all detected except Cr in wheat flour and corn flour. The contents of these elements in potato were higher than other crops except for Fe，Mn，Cr.