Abstract—The paper is dedicated to solving a problem of finding the area of values of unmanned underwater vehicle construction parameters providing desired oscillability degree of its motion control system with interval parameters. Construction parameters such as unmanned underwater vehicle length and maximal diameter, which are primary parameters, are linked with secondary parameters of unmanned underwater vehicle motion control system included in coefficients of its interval characteristic polynomial such as added masses of water and hydrodynamic coefficients. Authors propose a method of estimating unmanned underwater vehicle construction parameters by finding intervals of characteristic polynomial coefficients providing desired motion control quality. Example of the proposed method application is also provided.