The invention discloses a one-way path with a deceleration mark line. Concrete separation piles are arranged on two sides of a road along a driving direction and 100 to 150m before a pedestrian crossing and 50 after the pedestrian crossing; projected road signs are arranged on two sides of the road along a driving direction and 100 to 150m before a pedestrian crossing and 50 after the pedestrian crossing; a deceleration mark line is arranged along the driving direction till the pedestrian crossing; the deceleration mark line is formed by a first deceleration mark line set and a second deceleration mark line set connected with the first deceleration mark line; the first deceleration mark line is formed by a plurality of rectangular mark lines orderly connected and with gradually decreased widths and lengths; and the second deceleration mark line set is formed by a plurality of rectangular mark lines orderly connected and with gradually decreased widths and lengths. Driver speed sensing capability and distance sensing capability can be improved, so vehicle speed can be well controlled and pedestrian crossing safety can be guaranteed.