In this article the velocities of dashed waves of 5 areas in Ningxia have been determinated by wadati's method.On the basis of the velocities of dashed waves we determinated the seismic source depths related to 1460 times of shock.In the spatial distribution of these depths we find that the depths of seismic source in the region of Ningxia have become deepened gradually from south to north,but there is some difference in several re-gions where the earthquake is centrolized.In the region of Xihaigu the di-stribution of seismic source appears elliptic,and there is an irregular inte-rruption layer in the place of 15-20km,In the region of wuyin there is a source zone which extended northeastwards.In the region from wuzhong to Masanhu a dipping zone deepened gradually is emergent.In the region of Shijushan and its northern area the distribution is continuously la-yered in the main.In the line from Yinchuan to Shijushan there is a cline plane extended northwest,where a small earthquake gap is present.The force source that formed the seismic origin distributions as mentioned abo-ve is discussed in the article too.