Abstract: For overcoming the deficiency in arrangement of traditional turbine governors hydraulic system, employing a scheme to install the hydromechanical system at the turbine floor, a DJT-80WZ integrated seat-type governor was successfully developed and has been applied to a hydropower station in Napal. Test results show that the hydromechanical servosystem is not only simple in structure and convenient in installation and maintenance, but also its performance indexes are improved, i.e., rotational spead dead zone, ix≤0.030; the oscillation of no load ratational speed is ±0.06% when operating automatically and ±0.08% when hand operating; the motionless time of servomotor Tq=0.14 s; and the maximun load rejection time Tp=36 s. Associating with the situation of development of domestic governors, the neccessity of popularizing this type governor is presented.