Ground fissure disasters occur frequently in Linfen basin, which is located in southern Shanxi Graben System. The earth fissures formed in Houma depression, with large scale and severe disasters, have caused serious economic losses to local residents since 1990s. A case study of Beizhang earth fissures developed in Houma depression since 2007 was discussed in this paper. Through detailed surface investigation and mapping, the plane distribution characteristics of Beizhang earth fissures were found out. Furthermore, a trench was excavated which revealed the cross-section structure features of the earth fissures. According to the results of geophysical exploration, drilling, and InSAR, this paper analyzed the relationship among active fault, over-withdraw groundwater, and earth fissures. Finally, the formation mechanism of Beizhang earth fissures was obtained, and then some prevention measures were proposed to mitigate the hazards of Beizhang earth fissures.