The invention belongs to the technical field of road design, which relates to a method for determining lengths of upstream transition regions of a construction operation area. The method comprises the steps of: firstly, designing a driver SOAR (state, operator and result) intelligent agent working memory structure, secondly, designing initial long-term memory rules, and establishing a long-term memory rule base of driver SOAR intelligent agent, thirdly, establishing the decision-making period of the driver SOAR intelligent agent, fourthly, establishing a method for evaluating the road network traffic capacity through road network balance degree, and fifthly, setting lengths of different upstream transition regions and different road load coefficients to perform simulation, to obtain the road network balance degree data under lengths of different upstream transition regions of the construction operation area through simulation, and selecting simulation conditions with high balance degrees and good astringency, to obtain lengths of the appropriate upstream transition regions of the construction operation area under different traffic conditions. The method can accurately reflect the influence on the road construction traffic capacity by the lengths of the upstream transition regions of the construction operation area, thereby determining the lengths of the upstream transition regions of the construction operation area.