Abstract: A spacing and fertilizing trial with 4 replications and six levels each were established. The results show that within the range of the trial, the more the initial spacing, the younger the age to get quantitative maturity and rotation; quantitative maturity of spacing levels from 1 to 6 are 5.5, 6.2, 6.6, 6.7, 6.8 and 6.4 a respectively; the length of rotations are 5, 6, 7, 7, 7 and 6 a respectively, while the rates of economic benefit are 24.8%,23.9%,23.5%,22.8%,21.6% and 24.1%. The results also show that quantitative and economical maturity of fertilizing levels from 1 to 6 are 6.3, 6.6, 6.5, 6.5, 6.5 and 6.6 a, all between 6.3 a and 6.6 a, the length of rotations of all the levels are 6, 7, 6, 6, 6 and 7 a respectively and the rates of economic benefit are 20.4%, 21.5%, 23.6%, 25.0%, 26.6% and 23.1% respectively. All the levels of two treatments could be harvested at age 4 which the rates of economic benefit are all over 18%.