TBM boring machine is widely applied in tunneling excavation with its high speed, high efficiency, high safety and good quality, it is especially suitable for deep-lying long tunnel, but drives slowly in unfavorable geological tunneling section. In this case, special technical methods should be taken according to the surrounding rock characters, verification should be done to verify supporting method and design parameters. Summery was made in geological forecast method, treatment measures and deformation monitoring method in unfavorable geological tunneling condition with field case.