  The standard Hawking formula predicts the complete evaporation of black
holes. In this paper, we introduce effects of quantum gravity into fermions'
tunneling from Reissner-Nordstrom and Kerr black holes. The quantum gravity
effects slow down the increase of Hawking temperatures. This property naturally
leads to a residue mass in black hole evaporation. The corrected temperatures
are affected by the quantum numbers of emitted fermions. Meanwhile, the
temperature of the Kerr black hole is a function of $\theta$ due to the
rotation.
