[en] In fusion-fission process a unified macro-potential [UMP] is calculated. The shape of Royer's description in the incident channel and the Cassinian ovaloid in the out-going channel are used to calculate UMP with Yukawa-plus-exponential form of interaction. UMP against separated distance between two centers-of-mass with zero angular momentum for fusion-fission process is shown for ⁷⁴Ge + ⁷⁵As → ¹⁴⁹Tb and ⁹⁷Zr + ⁹⁷Zr → ¹⁹⁴Hg