Abstract: The timber of Yunnan pine (Pinus yunnanensis Franch.) grown in the south-eastern, north-western and the central region of Yunnan province are used for the study on physico-mechanical properties.According to the test results, the shrinkage coefficient, specific gravity, and compressive strength // to grain of the air-dried timber of Yunnan pine grown in the north-western part of Yunnan are the smallest, next in southeast, and the largest in central region. While the bending strength and modulus of elasticity of timber grown in south-east are the largest, next in north-west, and the smallest in central region. Owing to the timber of Yunnan pine, grown in the north-wetern region of Yunnan, are straight in grain, softer, easy processing and the smallest shrinkage coefficient, therefore the timber quality is the best. The quality of timber grown in central region is the lowest.The differences of physico-mechanical properties of the timber of Yunnan pine between various heights or heartwood and sapwood are very small. The differences of physico-mechanical properties between each tree are in 1—5%, most of which are about 2%.