  We determine the position space fermion propagator in three dimensional QED
based on Ward-identity and spectral representation.There is a new type of mass
singularity which governs the long distance behaviour.It leads the propagator
vanish at large distance more stongly than the mass term does.This term
corresponds to Dynamical mass.Momentum space proagator is compared with the
analysis of Schwinger-Dyson equation and our solution contains a non-perubative
effects beyond the quenched approximation with bare vertex.
