Interference　fits,　which　are　widely　used　in　the　high-speed　couplings　of　micro　gas　turbines,　can　transfer　large　torques　while　avoiding　unbalance.　Elastic　limit　pressure　is　an　important　parameters　for　determining　the　maximum　load　capacity　of　high-speed　couplings　of　rotating　elastic　interference　fits.　In　this　paper,　we　developed　a　model　to　study　the　dependence　of　the　maximum　load　capacity　of　rotating　elastic　interference　fits　upon　the　torques.　Then　we　obtained　the　exact　solutions　of　radial　stress,　tangential　stress　and　shear　stress　of　the　coupling　and　shaft　under　plane　stress　condition.　The　formulas　of　the　elastic　limit　pressures　of　interference　fits　were　derived.　Taking　a　100kW　micro　gas　turbine　as　example,　the　maximum　load　capacity　in　case　of　consideration　of　torques　could　decrease　approximately　20%　compared　with　that　without　this　consideration　under　two　parameters,　one　is　the　static　friction　coefficient;　the　other　is　the　ratio　of　inner　radius　to　outer　radius　of　the　coupling　and　shaft.