Abstract: according to the roof alling accident occurred in the heading period of No.2102 a uililry ransportation roatway in Talahao Mine.in order to ensure thesuppor safety and reliability of the mine roadway with the weak inding oofthecomputer numercal simulaton was appied to study the distrbution features of the plastic zone in the mine roadway with the weak binding rof when the main stress drection was at 0 ,15∶,30"45 "60 ,75' and g . The paper revea ed the surounding ockfailure law of the mine roadway. WNhen the main stess defecting direction was & and 45.the plasticzone in the surounding rock f the of would be max in sze.the falure depth would be 3.9 m,the plasticfilure of the surounding rock in the sidewall ould be small and the size of the pastic zone was 0.5 m.The key support was the roo support.According to the suspension theorythe bolt and anchor support parameters to prevent the roo falling were provided. The resuls showed that the roof displacement was small nd was 5~ 12 mm. The bed separation was mainly occured in ~ 2 m stratalevel and woud be taken over 65%.There was no deformation ocurred in the mine roadway and no roof falling accident occurred.The stability of the mine roadway was basically kept.