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In this paper, a new model with a total amount control target of allowable water withdrawal based on initial water right is built for the implementation of initial water right allocation scheme as well as unified allocation for allowable water withdrawal and sewage discharge. The model couples the water allocation simulation model and the computational model of permissible pollution bearing capacity. In view of the model complexity, a new technology which synthesizes system simulation, iterative reservoir turns and intelligent computation is proposed to improve the operability of allocation scheme and computational efficiency. Taking the Beijiang River Basin in the Pearl River Basin as an example, the study explains the model establishment, solution and application, and draws an optimized operation graph of large-scale reservoirs. The study also obtains a long-term operation strategy of river basin water resources system, the allocation schemes of allowable water withdrawal and sewage discharge in a typical year and the flow hydrographs of trans-boundary sections. The validity of the model and the allocation rationality are analyzed as well.water resources management, total control, unified control of water withdrawal and sewage discharge, optimized regulation, integration technology Citation:Hu S Y, Wang Z Z, Wang Y T, et al. Total control-based unified allocation model for allowable basin water withdrawal and sewage discharge. Sci