This research concerns the jet from an asymmetrical two-dimensional nozzle, especially about the influence of the lip length of the nozzle. The authors conduct experiments at a Reynolds number Re of 6000. The aspect ratio of the nozzle exit is fixed to 300. And, the lip length is 0, 2.0h, 3.3h and 5.0h, where h denotes the height of the nozzle exit. Using a hot-wire-anemometer, the authors show mean-velocity profiles at various downstream sections, in order to reveal fundamental characteristics of the jet in both the near and far downstreams. Furthermore, in the near downstream, the authors visualise the flow by smoke so as to get quantitative information using a PIV technique, and perform the dominant-frequency measurements.