The physical and mechanical properties of 11 new Populus deltoides clones species at 11years old were studied. The 11-year-old clone NL-351 was the control. The result showed there were significant differences in the physical and mechanical properties among the 11 clones were observed. Clone 4-45, 7-40, and 10-34 showed the better physical and mechanical properties than other eight clones. A positive correlation between density and mechanical properties was determined. Except the toughness, other five properties were significantly linear correlated.