The durability of ACQ,copper citrate（CC）,Chlorothalonil and CCA treated Masson Pine,Slash Pine and Poplar were tested at a typical sub-tropical area in Guangdong province in Southern China.The results showed that not all preservative-treated Poplar could be used in ground contact circumstances,and neither could Chlorothalonil be used for ground contact conditions at a retention of 6.4～8.5 kg/m,3,.ACQ-B and CC treated Slash Pine,under the same retention level,had almost equivalent effect for preventing decay and termite infestation.The stakes of Masson Pine and Slash Pine,treated by ACQ-B and CC at a retention of 6.0～6.8 kg/m,3, in a 6-year-test,exhibited good resistance for decay and fare resistance for termites;while that treated by ACQ-B,CC and CCA,around a retention of 10 kg/m,3,have extremely fine resistance for decay and termites after the 6-year test.