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One longstanding puzzle concerning photosystem Ⅱ,a core component of photosynthesis,is that only one of the two symmetric branches in its reaction centre is active in electron transfer.To investigate the effect of the photosystem Ⅱ environment on the preferential selection of the energy transfer pathway(a prerequisite for electron transfer),we have constructed an exciton model via extensive molecular dynamics simulations and quantum mechanics/molecular mechanics calculations based on a recent X-ray structure.