Abstract: Most pumped-storage power stations(PSP)in China employ designing of mulit-unit configuration sharing common tube.Serious hydraulic disturbance phenomenon occurs in multiple units sharing the same tube.In this paper,taking Xianju pumped-storage power station for example,load disturbance test of pumped-storage power station with two-unit sharing common tube has been performed.Stability parameter variation principles under speed governor opening control mode and constant power mode have been researched,including unit vibrations,unit swing,pressure pulsations,etc.The variation of electromagnetic stability of the disturbed unit was analyzed,and the variation of operating parameters in the two modes was discussed.The results showed that under the condition of two units sharing common tube with rated load running,when one unit's load disturbed the other unit,the disturbed unit load varied larger in speed governor opening control mode than in constant power mode.Disturbance frequencies from load rejection unit were found in some stability parameters of the disturbed unit.The disturbed unit responds well,keeping related parameters within controllable ranges.