Due to the problems of the full hydraulic bulldozer when matching,the key technical parameters,such as the slip ratio,the efficiency,the force-to-weight ratio and the power-to-weight ratio are studied in the paper. At first,the rated slip ratio should be 12%~15% through the analysis of the configuration of the drive efficiency on the slip curve. Second,the fitting formulae of experimental data of typical pumps and motors are got after deeply analyzing the effect of pressure and displacement on the efficienc...