In this paper,the short-period geomagnetic events in and around Sha-nxi are analysed.It is found that the directions of variation in vertical component on the south and north sides of the Wei River which is taken as a rough boundary are opposite.It can be inferred that there exists an east-west belt of high electrical conductivity beneath this region.From other characteristics of short-period geomagnetic variations,a rough est-imate of shape and properties of the belt is made.Connecting this belt wi-th that discovered in eastern Kansu,a belt of high electrical conductivity of 1,000-odd km.will be formed.