The behavior of bond strength of five types of bolts is investigated by laboratory pull-out test. In steel bar, bond stress is transferred by mechanical interlocking between knots of steel bar and grout. On the other hand, bond strength behavior of cable bolts is mainly governed by friction between PC strand and grout. Bond strength of tested cable bolts are lower than those of steel bar, but it showed that indented PC strand cable bolts are useful bolts to have twice bond strength compared with ordinary PC strand. On the influence of grout type (cement and mortar) on bond strength, it seems that bond strength of cable bolts are independent on two grout types. Numerical simulations of laboratory pull-out test and excavations and prereinforcement by cable bolting of large span tunnel are carried out to study the application of cable bolt element in FLAC to bond strength behavior.