Radiata pine（Pinus radiata） wood was treated under high energy density microwave conditions to improve its bending property. The results showed that the coefficient of Pinus radiata wood bendability increased at the beginning of the process, then decreased with the increasing of microwave energy density. Through a proper pretreating process, the excellent bending property of Pinus radiata wood could be obtained. When the microwave energy density increased to a certain value, microscopical cracks appeared in wood, and the bending properties decreased. The optimal microwave pretreatment process was 100 kW（microwave power）, 1.0 m/min（processing speed）; the corresponding energy density of microwave treatment was 31.56 kW·h/m3. For Pinus radiata wood treated under the optimal condition, the maximum coefficient of bendability Kbend was 0.032（corresponding to the coefficient derivative of bendability 1/Kbend value of 31.25）, which was higher than that of the untreated beech, ash wood and elm wood.