In this thesis, transition in the boundary layer on a flat plate is examined from the point of view of intermittent production of turbulent spots. To investigate the transition from laminar to turbulent flow, time record of $\mu$-component oscillation near the wall along the flat plate is examined, and the mean and fluctuating characteristics of the boundary layer is measured using the hot-wire anemoneter. It is confirmed that the intermittency factor in the transitioal region of the boundary layer is expressed by one statistical similarity parameter.
The skin friction over the transitional region is measured by LISF(Laser Interferometry Skin Friction meter) and compared with the result of an empirical formula based on intermittency factor $\gamma$ . Using the measured skin friction, the mean velocity profiles are transformed with the wall coordinate during the transition are displayed.
