Abstract: To achieve the sustainable managements of Eucalyptus, comparison on the accumulation and cycle of Zn was made among Eucalyptus.ABL12, E.urophylla and E.exserta with field sampling and data analysis methods. Results show that average contents of Zn in Eucalyptus.ABL12, E.urophylla and E.exserta plantations are 28.42 mg/kg,13.64 mg/kg and 18.03 mg/kg respectively, and accumulations of Zn in the three forests are 2.7365 kg/hm2,1.4110 kg/hm2 and 0.6139 kg/hm2 respectively. Annual retention of Zn is in sequence of E.ABL12＞E.urophylla＞E.exserta, and annual restitution is in sequence of E.ABL12＞E.exserta＞E.urophylla. The cycling coefficient of Zn in E. ABL12, E. urophylla and E. exserta was 0.66, 0.69 and 0.84 respectively. There are some differences between Eucalyptus urophylla forest with understory vegetation and the one without understory vegetation,for examples, contents, accumulation, annual retention, annual restitution, annual absorption and recycling coefficient of Zn are 54.37 mg/kg, 1.6806 kg/ hm2?a, 0.3360 kg/hm2?a, 0.6777 kg/hm2?a,1.2483 kg/hm2?a and 0.86 in the former respectively, while 54.73 mg/kg, 1.1732kg/ hm2?a, 0.2346 kg/hm2?a, 0.6072 kg/hm2?a, 0.8418 kg/hm2?a and 0.90 in the latter respectively. Conclusions can be made that litters makes a difference in development of understory vegetation and maintaining the dynamic balance of Zn in Eucalyptus forest.