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We have established a hierarchy of forward-backward stochastic Schr(o)dinger equation in the light of stochastic unravelling of the symmetric part of the influence functional in the path-integral formalism of reduced density operator.The method is numerically exact and is suited for Debye-Drude spectral density,Ohmic spectral density with an algebraic or exponential cutoff,as well as discrete vibrational modes.The power of this method is verified by performing the calculations of time-dependent population differences in the valuable spin-boson model from zero to high temperatures.By simulating excitation energy transfer dynamics of the realistic full FMO trimer,some important features are revealed.