Abstarct: Drag force has always been one of the most important factors in the design and construction of marine vessels. Reducing drag force saves energy, and concequently, reduces pollution. In recent decades, various methods, including the use of hydrophobic paints, solutions Polymer, air cavities, air film, and adaptive coatings are used to reduce drag, all of which have advantages as well as disadvantages. Nowadays, one of the new methods in reducing drag is the injection of micro bubbles. In this study, some physical and numerical tests were carried out in order to study thw reducing of the drag force on a sample vessel with the help of micro- nano- bubble injection and the mechanism governing this phenomenon, The relationbetween water containing air micro-nano bubbles (AMNBs) and water in reducing drag on the floating body of the boat were investigated. According to the results, water containing AMNBs reduces the drag force, the amount of which has been about 4% to 62% at different speeds. In addition, numerical modeling calculates the coefficient of floating drag at flow rates of 0.5 m / s and 1 m / s. And its adaptation to the laboratory model has been done, which with a percentage of error of about 7 and 15% of the desired modeling, respectively.