Abstract: The bean yield was low and insrable because of damage caused by cyst nematode of soybean in Shanxi.In order to lay a foundation for scientific research and control,a cooperation group of investigation had established in 1984.This disease was investigated in whole provincial region with township by the cooperation group from 1984 to 1986.We investigated totally 111 counties and 1681 townships,at the same time,collected 2602 soil samples.The geographic distribution,demage extent and host range of cyst nematode of soybean have been found out basically.The 111 counties and 1573 townships were discovered areas.There were 2303 soil samples which contained the cysts.The result Shows that soybean cyst nematodiasis has been occurring anywhere in Shanxi.Most of areas belong to the slight disease regions,but exist many serious disease fields.We found out 13 species host plants in Shanxi.It was obvious that bean crops were host of this nematode.The Shanxi name list for geographic distribution,damage extent and host range of cyst nematodiasis of soybean had been compiled according to the investigation result,and the scattering chart had been drawed up too.This not only afford a experience of organization and leadship for future,but also provide a referntial material for scientific research and control In whole provincial region investigating clearness with township is the first time at home.

Key words: Soybean, Cyst nematodiasis of soybean