  For Hawking radiation, treated as a tunneling process, the no-hair theorem of
black hole together with the law of energy conservation is utilized to
postulate that the tunneling rate only depends on the external qualities (e.g.,
the mass for the Schwarzschild black hole) and the energy of the radiated
particle. This postulate is justified by the WKB approximation for calculating
the tunneling probability. Based on this postulate, a general formula for the
tunneling probability is derived without referring to the concrete form of
black hole metric. This formula implies an intrinsic correlation between the
successive processes of the black hole radiation of two or more particles. It
also suggests a kind of entropy conservation and thus resolves the puzzle of
black hole information loss in some sense.
