The article presents the study results of the sub-project 2 of the Vietnam-Russia cooperation (2009-2011) on the structure and components of the fteneral current of the waters near the mouth of the Nha Trang bay, during the changed season of the wind system from the Northeast monsoon to Southwest monsoon (April-May, 2011), based on tha analysis of flow measurements at the continuous station of two days and nights by the self-recording apparatus AWAC and RDCP-600. It can be concluded in the survey area that the tidal component is dominant, but with small size of the time and space, and the inertial cold flow with the big size of the time and space, so although the speed current is not great, but plays a very important role in affecting the distribution characteristics of the hydrological elements and water masses in the survey sea.