Water Conservancy Engineering Quality Supervision Station of Sanming City，Sanming 365200，China

Advanced small pipe technique can improve the physical properties of surrounding rock.And it can glue the cement slurry in soft surrounding rock and small catheter implantation to form a whole.A small catheter for bearing arch frame was formed to prevent tunnel soft surrounding rock collapse accident during excavation process.Application of advanced small pipe technology in tunnel engineering soft surrounding rock of Huangshakeng reservoir was introduced from making small pipe，layout，grouting and other aspects.