Three components of the wind vectors and diffusion parameters were obtained automatically in 50 m steps from 150 to 500 m height with an acoustic Doppler radar system (Doppler sodar) in August, at Niihama seashore and in July and August, 1982, at Okayama plain, western Japan. By comparing the data with the pilot balloon and radiosonde data, the following results were obtained:
   a) Horizontal wind vectors with the Doppler sodar agreed fairly well with the pilot balloon data.
   b) Vertical flow with the Doppler sodar matched well with the topographic and thermal conditions. Remarkable vertical flows were produced mainly with thermal plumes or dynamic effect of buildings in the inland flat field, while they were limited in the case of land-sea breeze alternations or synoptic front passage over the seashore.
   c) Diffusion parameters showed also some characteristic patterns. The parameters increased separately in limited wind systems over the inland field in relation to thermal and dynamic conditions, while they increased altogether over the seashore on the occasion of wind turn.
   d) Profile patterns of the diffusion coefficient Kz, estimated from the Doppler sodar data for a fine summer day, agreed roughly with the profiles from the pilot balloon and radiosonde data. However, characteristic differences were found between the Kz values in the specific height in the daytime and those in the nighttime.