  In this Letter, we propose that a microphysical process takes a vital role in
the shocked region in which the prompt emission of GRBs is emitted. The
turbulent energy is included in the internal energy transferred by the kinetic
energy of the shock. It dissipates through stochastic acceleration for the
electrons to supply the early X-ray emission in the phase of shallow decay. We
put the constraints on the time evolution of microphysical parameters. The
early X-ray fluxes can be obtained by this scenario and these results are
consistent with the Swift observation
