The invention is concerned with the up link speed adjusting method in the IuUP support mode, it is: accesses with the lower ensuring speed when the district load or Iub port congests, in order to ensure the quality of the communication and save resource; when the resource recovers, the speed controlling entity of resource end changes the application mode by sending speed with same direction, processes the adjustment of the up data transmission rate initiatively, upgrades the operation transmission rate to be the fit speed in order to reform the communication effect and the application qualityon time, and avoids the status that the resource congestion by the single fault, or the intensifying CN or the opposite end RNC, solves the problem that the resource end speed controlling entity can not process up data transmission rate adjustment.