Abstract:In the process of the underwater robot sailing, aiming at the requests for energy savings, reducing resistance and improving the speed, mathematical linetypes based design method was adopted to investigate shape optimal design of underwater robot. Under the conditions of the same displacement,adopting fluid calculation software Fluent, compare of linear sailing resistance of underwater robots structured separately by four different linetypes was executed. According to the principle of least resistance, considering the space requirements of the internal components layout, Myring linear equations were selected to build shape of underwater robot. According to the two data points,adopting software Visual C++, the head sharpness factor and tail departure angle in Myring linetype equation were determined. After the two exterior parameters determined, shape optimal design of underwater robot was completed. The research results can reach to purposes for reducing the sailing resistance and improving the hydrodynamic performance of underwater robot.