In order to investigate the quantitative relationships between earthworm density and the major parameters such as pH，electrical conductivity (EC)，organic matter，total nitrogen，alkali nitrogen，total phosphorus，available phosphorus，total potassium，available potassium，available Ca，available Mg and cation exchange capacity (CEC) were analyzed to establish the quantitative relationships between earthworm density and the collected data.It was found that earthworm density was significantly and negatively related with soil pH(P<0.001)，while significantly and positively related with organic matter and total nitrogen and phosphorus (P<0.002).There were not significant relationships among earthworm density and other parameters.Five classes could be divided according to the relationships，which may be valuable for estimating the impacts of earthworm on soil chemical fertility.