In this study, a wind-tunnel experiment on flat plate with 1.0% free-stream turbulence intensity is performed to investigate intermittency measuring methods in transitional boundary layer, with an emphasis on the behavior along the direction normal to the wall. I-type hot-wire probe is used to measure instantaneous streamwise velocities in laminar, transitional, and turbulent boundary layer. To estimate wall shear stresses on the flat plate, near wall mean velocities are applied to the principle of Computational Preston tube Method (CPM). Distribution of intermittency factor is obtained by Dual-slope method and compared to the result of M-TERA method. Both methods show good agreement in the near wall region. However, the result of M-TERA method shows that intermittency factor is underestimated in the outer part and outside of the boundary layer, and the dimensional constant of M-TERA method should be changed appropriately depending on measuring point.