[en] The H mode achieved by applying an edge ohmic heating pulse in HT-6M shows some new features. The floating potentials and their fluctuations at different radial positions are comparable to the ohmic phase levels before and during the L-H transition and increase after the H-L transition. The time-scale of the L-H transition is of the order of 1 ms, which is unusual. During the H confinement regime the plasma current becomes peaked. The MHD instabilities terminate the H mode or cause discharge disruption. Analyses show that edge current and relevant magnetic shear play a decisive role in establishing the transport barrier. The time-scales of the L-H transition and current penetration are governed by the resistive diffusion time. (author). 13 refs, 3 figs