Soil physico-chemical characteristics are an important part of soil comprehensive fertility，which is of great significance for diagnosing the soil quality and can provide a reference for the rational management of plantations.Taking 20 long-term (10-60 years) continuous cropping poplar plantation plots in the main planting area of poplar trees in Shandong province as the research objects，15 soil indexes were measured，and the physico-chemical characteristics of the forest soil were studied.The comprehensive fertility of the soil was evaluated by the comprehensive index method.The results showed that total potassium and alkaline nitrogen contents in soil of poplar plantations were generally at a “very low” level，organic matter，total nitrogen，total phosphorus and conductivity (EC) were at a “low” level，and the available phosphorus，available potassium and bulk weight were at a “moderate” level，while the capillary porosity was at a “high”level.The soil texture from 80% of the plots are slightly alkaline sandy loam or loam sand，with a high sand content，while the contents of silt and clay are low.There were large differences in soil comprehensive fertility between different plots，with the highest comprehensive soil fertility in poplar plantations in northern region of Shandong province，which was significantly higher than those in the southern，western，and southwestern cultivation areas of Shandong province.The correlation analysis showed that eight soil physico-chemical indexes，such as soil organic matter，total phosphorus，total potassium，available phosphorus，available potassium，bulk weight，silt and clay，had a significant impact on the soil comprehensive fertility index，while the correlation between the soil comprehensive fertility and other seven indexes，such as total nitrogen，alkaline nitrogen，pH，EC，capillary porosity，sand and silt/clay，was not significant.Poplar continuous cropping time，stand age and density did not have a significant effect on soil fertility of plantation.