On the basis of the small-plot experimental data of the years 1983-1986 at the Qianyanzhou Experimental Station of the Chinese Academy of Sciences at Taihe County of Jiangxi Province and using the compartment model with the help of computer, the cycles of P, K, Ca, Mg, Fe and Mu in areas where the vegetation is Pine (Pinus mossoniana), Chinese sweet gum (Liqui-dambar formosana) and natural secondary forests (control area.) respectively are successfully simulated.The simulation results quantitatively describe how these elements move and transfer along the food chain from the plant, animal, litter layer to the soil within 0-10 years. The paper also calculates their cycle coefficients and the balance points at the time when they reach a stable state.