Soybean cyst nematode（SCN Heterodera glycines Ichinohe） is one of the most important nationwide soybean pests in China.Density of SCN in 26 areas of Liaoning Province during 2006~2008 was determined for clarifying the distribution of SCN.The results showed that Heterodera glycines was found in 88%areas,and the number of cyst per 100 g soil was more than 10 in 73%areas.The cyst density of Kangping was the biggest,up to 54.33,but the cyst density of Kaiyuan,Donggang and Huanren was 0,most areas were between 20 to 55.