A method for joint power control in multi-user multiplexing technology comprising: according to reference power values of two Voice services over Adaptive Multi-user channels on One Slot, VAMOS, users, determining an initial power ratio, SCPIR, value of the two VAMOS users; if the initial SCPIR value is out of a set SCPIR range (201, 202, 203, 210, 211, 212) then adjusting the reference power value of at least one VAMOS user in the two VAMOS users so that a SCPIR value of the two VAMOS users after adjustment is in the set SCPIR range, wherein the reference power value of the VAMOS user is determined according to a single user power control method; wherein, the joint power control comprises downlink initial joint power control, downlink regular joint power control, uplink initial joint power control and uplink regular joint power control; when performing the downlink initial joint power control and the downlink regular joint power control, and when the SCPIR value of the two VAMOS users after adjustment is in the set SCPIR range, the method further comprises: if judging that a total power of the two VAMOS users after adjustment exceeds a set value (205, 206), then adjusting the reference power values of the two VAMOS users again, until the total power of the two VAMOS users after adjustment is less than or equal to the set value and the SCPIR value of the two VAMOS users is in the set SCPIR range (207, 208); wherein, when performing the downlink regular joint power control, and when the total power of the two VAMOS users after adjustment is less than or equal to the set value and the SCPIR value of the two VAMOS users is in the set SCPIR range, the method further comprises: if judging that a power adjusting step length of the VAMOS user exceeds a power adjusting step length threshold (211, 212, 213), then adjusting the reference power values of the two VAMOS users again, until the total power of the two VAMOS users after adjustment is less than or equal to the set value and the power adjusting step length of the VAMOS user is less than or equal to the power adjusting step length threshold, and the SCPIR value of the two VAMOS users is in the set SCPIR range (214, 215, 216). according to reference power values of two Voice services over Adaptive Multi-user channels on One Slot, VAMOS, users, determining an initial power ratio, SCPIR, value of the two VAMOS users; if the initial SCPIR value is out of a set SCPIR range (201, 202, 203, 210, 211, 212) then adjusting the reference power value of at least one VAMOS user in the two VAMOS users so that a SCPIR value of the two VAMOS users after adjustment is in the set SCPIR range, wherein the reference power value of the VAMOS user is determined according to a single user power control method; wherein, the joint power control comprises downlink initial joint power control, downlink regular joint power control, uplink initial joint power control and uplink regular joint power control; when performing the downlink initial joint power control and the downlink regular joint power control, and when the SCPIR value of the two VAMOS users after adjustment is in the set SCPIR range, the method further comprises: if judging that a total power of the two VAMOS users after adjustment exceeds a set value (205, 206), then adjusting the reference power values of the two VAMOS users again, until the total power of the two VAMOS users after adjustment is less than or equal to the set value and the SCPIR value of the two VAMOS users is in the set SCPIR range (207, 208); wherein, when performing the downlink regular joint power control, and when the total power of the two VAMOS users after adjustment is less than or equal to the set value and the SCPIR value of the two VAMOS users is in the set SCPIR range, the method further comprises: if judging that a power adjusting step length of the VAMOS user exceeds a power adjusting step length threshold (211, 212, 213), then adjusting the reference power values of the two VAMOS users again, until the total power of the two VAMOS users after adjustment is less than or equal to the set value and the power adjusting step length of the VAMOS user is less than or equal to the power adjusting step length threshold, and the SCPIR value of the two VAMOS users is in the set SCPIR range (214, 215, 216).