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## Main Question or Discussion Point

Please teach me this:

I think that renormalization problem happens in perturbative QFT,but not happens in nonperturbation theory.So I do not understand why renormalization problem appears in Quantum Gravity Theory despite of there are many nonperturbation theory to solve the problem?

Thank you very much for your kind helping.

I think that renormalization problem happens in perturbative QFT,but not happens in nonperturbation theory.So I do not understand why renormalization problem appears in Quantum Gravity Theory despite of there are many nonperturbation theory to solve the problem?

Thank you very much for your kind helping.