In order to obtain the K and T indices calculation empirical formula of kiloton standard ship type on the Wujiang River waterway, a Ship Maneuvering Mathematical Model Group (MMG) model adapted to the ship type is proposed based on the characteristics of Wujiang River waterway and kiloton ship, and the model accuracy is verified by the ship model test data. The model is used to simulate a series of kiloton ships, the Z-shaped steering motion curve is obtained, and the dimensionless K and T indices of the series of ships are obtained by the Nomoto method. The results obtained are taken as the sample base, and the empirical formula of dimensionless K and T indices adapted to the Wujiang River kiloton ship is obtained by the cross quadratic regression method. On this basis, the test data of three real ships are used to verify the accuracy of the empirical formula proposed.