This study aims at getting the relationship between semi-volatile organic pollutants’ recoveries of liquid-liquid extraction in water and their n-octanol/water partition coefficients（lgKow）.The results showed that,the semi-volatile organic pollutants’ recoveries in water and their n-octanol/water partition coefficients（lgKow） has the following contact:when lgKow＜5,the semi-volatile organic pollutants’ recoveries in water range from 16.1% to 56.1%;and when lgKow ＞5,the semi-volatile organic pollutants’ recoveries in water range from 59.5% to 124.9%.In the same way,a study on the relationship between semi-volatile organic pollutants’ recoveries in water and their solubility（lgS） was also carried out,the study about lgS could be used to verify the conclusion obtained.And much the same conclusion was drawn,when lgS＞-0.60,the semi-volatile organic pollutants’ recoveries ranged from 16.1% to 56.1%;and when lgS＜-0.60,the semi-volatile organic pollutants’ recoveries ranged from 59.5% to 124.9%.From above,the conclusion derived from semi-volatile organic pollutants’ recoveries and lgKow and lgS,respectively,is consistent.During the course of detecting environmental groudwater samples,the recoveries of laboratory fortified blanks and their n-octanol/water partition coefficients（lgKow） were used to verify the conclusion,and the results showed that it is consistent with that derived by discussing the relationship between semi-volatile organic pollutants’ recoveries and n-octanol/water partition coefficients:when lgKow＞5,or lgS＜-0.60,the recoveries ranged from 85.3% to 115.9%.