Strong valley winds of 10 to 15 m/sec were observed in the daytime during a stay in the Kali Gandaki Valley in November, 1976. This valley wind, which seems to exist throughout the year, is studied using the wind-shaped trees in this valley as an index. The wind-shaped trees which were most strongly deformed were found between Larjung and Jomson. In other regions some moderately deformed wind-shaped trees were found at places with local topography favorable for their formation. Deformation was weak in the tributaries of the Kali Gandaki.