Abstract: To explore the relationship between nutrient element contents and the age and health of Platycladus orientalis in Mount Tai, we measured and analyzed 15 mineral element contents of 12 ancient trees Platycladus orientalis in Luohanya forest farm and Wangmuchi area. The result showed that: except for Ni and Co, other element contents in weak ancient trees were higher than those in health ancient trees; besides, contents of Ca showed significant differences between the leaves of weak ancient trees and health ancient trees, and Pb in weak ancient trees was 29.35% higher than that in health ancient trees which indicated that the weak growth condition of ancient Platycladus orientalis in Luohanya might be related to the high levels of Ca and Pb; there was significant difference of Na between the first and three levels ancient trees Platycladus orientalis, that was to say, the content of Na with high age was lower than that with low age; mineral element contents of ancient trees with the same health levels and same age class levels were equivalent in Luohanya and Wangmuchi areas. This study finds out the contents and changes of the mineral elements closely related to the weak and age of ancient Platycladus orientalis trees, and provides a reference for nutrition diagnosis and health evaluation in Mount Tai.