Numerical prediction methods both for the thermal interruption capability and the dielectric recovery capability of SF6 gas circuit breaker（GCB） are reviewed in the paper.The arc conductance 200 ns（G200） before current zero is a key parameter of the thermal interruption capability of the GCB.The magneto-hydro-dynamics（MHD） model is applied during the arcing process and the Mayr model is adopted near current zero to evaluate the G200.Then the arc time constant and the arc power loss coefficient could be obtained.To evaluate the dielectric recovery capability of GCB

the reduced electric field strength Ec has to be calculated everywhere in the interrupter after current zero.The reduced critical electric filed strength Ea has to be computed as well.The probability of the dielectric breakdown after current zero can be judged by the comparison of the Ea and Ec.It has to be indicated that the proposed numerical prediction methods are still need to be verified by further experimental efforts.