  In this paper we will show a general method of how to make an optimized
parameter design of a circular e+e- Higgs Factory by using analytical
expression of maximum beam-beam parameter and beamstrahlung beam lifetime
started from given design goal and technical limitations. A parameter space has
been explored. Based on beam parameters scan and RF parameters scan, a set of
optimized parameter designs for 50 km Circular Higgs Factory (CHF) with
different RF frequency was proposed.

Accelerator Physics