Abstract: In this paper, the experimental data of the horizontal wind speed fluctuations at different heights from 100 to 1470 meters given by Deveatova are analysed. The main results are:1. The horizontal wind speed fluctuations at any height may be approximated by a Gaussian distribution. 2. For at a height no more than few hundred meters the well-known "2/3 law" is hold within a length scale comparable to or-several time larger than the height:3. At higher levels, the scale range in which the "2/3 law" holds good, is usually less than the height itself and no definite relationship between this scale range and the height has been found. The representativeness-of the data is also discussed.