Abstract: In the cdma2000 1x mineral system，reverse packet data applications，such as spot video and environmental data collection are very important.These reverse data services，which need high reverse data rate，would produce severe interference to other users on the reverse link. To obtain a stable and efficient system，a Call Admission Control（CAC） scheme with reverse interference control is preferred.After a detailed analysis of the composing of reverse interference，a practical call admission control scheme basing on ROT is proposed in order to satisfy the Quality of Service（QoS） requirement of each traffic channel and the ROT limit of the system.