Abstract: In terms of the attitude correction of the sensors position in hydrographic survey, determination of the barycenter of the surveying boat accurately is necessary. Based on the RTK technique, a new method for determination of the barycenter of the surveying boat is presented and a series model is developed under static state. The simulated results show the calculations and the true values are in a good consistency. The validation and reliability of the new developed approach is verified. The error of the barycenter position of the surveying boat determined by the observation including RTK noise level can also be neglected.