Objective To analyze the current levels of lack situation of blood constant elelments of 0~13 years old children in Yuexiu district,Guangzhou. Method The constant and trace elements of 3 475 children aged 0~13 years old were measured and compared. Results Zinc and calcium were in the biggest need.Zinc ranked the first(24%)in the four age groups,and calcium ranked second(6.1%).The absent rate of calcium increased by the ages,and the absent rate of zinc decreased by the ages,especially in infants.There was no significant difference of these five constant elements between boys and girls. Conclusions Lack of some constant and trace elements are common and related of diet behavior.The relevant media should be proposed in the diet structure and correcting bad diet behavior.Regular inspection,adjust diet structure or add reasonable drug timely based on ages and genders are needed.