The p1asma heated by a whistler wave in the magnetic fie1d configuration which is necessary for the formation of sloshing e1ectrons is investigated. Detai1ed measurements of the parameters of the p1asma about the resonance zone are presented. The experiment results show that；(1)there exists a density peak and a temperature peak near the resonance zone；(2)the peaks together with the resonance zone move as B(the magnetic fie1d of the mirror center)changes；(3)the physics mechanism of the p1asma heating is that a lot of e1ectrons absorb the microwave and turn back near the resonance zone.