Abstract: When soft rock roadway passes the water conductive fault fracture zone, the surrounding rock often faces grea tinstability risks. Based on this, FLAC3D is used to perform numerical simulation analysis on the stress, deformation and failure characteristics when it passes through the fault considering the softening effect of mudstone and siltstone by water. And the combined support technology of “advanced deep-hole curtain grouting for water blocking + local advanced small pipe grouting + anchor belt net and cable beam” is proposed, and the deformation and failure law ofsurrounding rock in the soft rock roadway after the support is comparatively studied. The research results show that: when the soft rock roadway is excavated close to the fracture zone of water conductive fault, the maximum settlement of the vault and the horizontal displacement of the side walls are about 510% and 166% higher than that before the immersion because the mudstone and siltstone of the coal roof are affected by the soaking of fault water. While the failure depth of the plastic zone of surrounding rock is about 0.5 m to 4.6 m larger, this leads to the part failure of supporting structure. After adopting the combined support of “advanced deep-hole curtain grouting for water blocking + local advanced small pipe grouting + anchor belt net and cable beam”, the stability for surrounding rock in soft rock roadway crossing the fault has been effectively controlled. And the final vault settlement and side wall displacement can be controlled within 32 mm, while the fracture depth of plastic zone is basically 1.7 m to 2.0 m in the roof and two sides.