Natural Quercus broadleaved mixed forest is a common type of vegetation in mountainous area of South Anhui. Based on the investigation of the large plot of natural Quercus broadleaved mixed forest in Yeshan Forestry-farm of Tongling County, the spatial distribution patterns and their associations of the dominant tree species with the Ripley's K (d) point pattern analysis were analyzed. The results indicated that the diameter distribution of Quercus dominant populations showed a left-skewed distribution, with even-aged forest diameter distribution characteristics, and were of developing populations. The spatial distribution pattern of Quercus acutissima population was aggregated, random and uniform distribution on a scale from 0 to 39 m, 40 to 42 m and over 42 m, respectively. The spatial distribution pattern of Cyclobalanopsis glauca was aggregated, random and uniform distribution on a scale from 0 to 40 m, 41 to 47 m and more than 47 m, respectively. The spatial relationships of the population between Quercus acutissima and Cyclobalanopsis glauca were negatively correlated from 0 to 34 m, and positively associated on a scale of more than 43 m. The spatial relationship between the larger tree（DBH≥20 cm）and the small tree（DBH＜20 cm）for Quercus acutissima and Cyclobalanopsis glauca were positively associated on a small scale（0-25 m）, negatively correlated on a large scale (51-65 m), and were not correlated on a medium scale (26-50 m).On most scales, there were no correlation between the tree species of Quercus and other associated tree species.