The plasma energy and particle confinement could be improved by LHCD in HT-6B tokamak. A multichannel La monitoring system was used for the measure-ment of particle oonfinement in the experiment. The particle confinement time has been increased two to six times by LHCD. There is no apparent relation between the τp increment degree and the input LHW power (10-60 kW). But there is a good correlation between the appearance of improvement and the appearance o: the energetic electrons caused by LHCD. With the measurement of emissivity ratio of OII 441.8 nm and OII 446.6 nm within the plasma edge(r=8.5-11.0 cm for α=12 cm). We discovered that, when improvememt happened, the gradient of electron temperature in plasma edge increased, the same tendency of the change“in the case of H-mode.