  In non-supersymmetric covariant quantum gravity theory, for each system of
gravity coupled with single field is one-loop divergent. Since adding other
fields or other interactions to each system generates more possible
counter-Lagrangian terms, there is room for improvement to restore
renormalizability. In this paper, we consider Einstein-Maxwell fields coupled
with electrically charged scalar which is the simplest model among the systems
of gravity coupled with multiple fields having their own interaction. First, we
introduce how to calculate the possible one-loop diagrams in Einstein-SQED
system and show that this system is non-renormalizable.
