NOVELTY - Optimal design of membrane bioreactor system comprises detecting water quality parameters of inlet water and calculating the volume and aeration cell gas providing quantity of membrane bioreactor; establishing membrane bioreactor technical mold in computer by simulation software containing Activated Sludge Model No.1 (ASM1) according to water quantity parameter, the volume of membrane bioreactor and the aeration cell gas providing quantity; and establishing membrane bioreactor technical mold to process dynamic imitation and judging whether the water quality meets the design requirement.    USE - Method for optimally designing membrane bioreactor system.    ADVANTAGE - The method not only overcomes the shortages of pure experimental design method of being conservative, but also avoids that the result is partial to theorization when using the ASM1 mold to process the wastewater processing technical design directly and avoids the disadvantages of not meeting the requirement of the engineering discipline.    DETAILED DESCRIPTION - Optimal design of membrane bioreactor system comprises:    (A) detecting water quality parameters of inlet water and calculating the volume and aeration cell gas providing quantity of membrane bioreactor according to experimental formula and experimental parameter;    (B) establishing membrane bioreactor technical mold in the computer by the simulation software containing Activated Sludge Model No.1 (ASM1) according to water quantity parameter of inlet water, the volume of membrane bioreactor and the aeration cell gas providing quantity obtained in step (A); and    (C) establishing membrane bioreactor technical mold to process dynamic imitation and judging whether the water quality meets the design requirement; and if the water quality is better or below the standard, regulating the volume and aeration quantity of membrane bioreactor to obtain the minimum reactor container and aeration cell gas providing quantity of membrane bioreactor and processing the dynamic imitation again until the water quality of the outlet water meets the designed requirement.    DESCRIPTION OF DRAWING(S) - The drawing is a block diagram of an optimal design method of membrane bioreactor system (Drawing includes non-English language text).