Ultrahigh-temperature high entropy ceramics are composed of refractory metal carbides， borides and nitrides， which exhibit high hardness， high temperature strength and good thermal stability. Ultrahigh-temperature high entropy ceramics become one of the hot research directions in the field of ultrahigh temperature ceramics. Compared with traditional materials， ultrahigh-temperature high entropy ceramics involve complex component space， multiple scale dimensions and extreme multi-field coupling service environment. The efficiency of developing ultrahigh-temperature high entropy ceramics by traditional trial and error method is poor. Therefore， it is necessary to change the material research paradigm and improve the developing and application efficiency of ultrahigh-temperature high entropy ceramics by relying on multi-scale simulation calculation method. The representative multi-scale material calculation methods is briefly introduced， and the typical application achievement of multi-scale materials calculation methods in the research of ultrahigh-temperature high entropy ceramics are summerized. Finally， the prospect of multi-scale material calculation methods in the research of ultrahigh temperature high entropy ceramics is prospected.