LHCD is one of the main variant of Tokamak non-inductive current drive, some encouraging results in high density regime have been reported recently. In our country, the two backbone devices, the HL-1M and the HT-7 have worked for many years in this area. The other two large Tokamaks now in building, the HL-2A and the HT-7U will also work on such subject. Theoretical study of LHCD had been carried out for years and now there are several codes to simulate the deposition of the wave power and the current LHCD is one of the main variant of Tokamak non-inductive current drive, some encouraging results in high density regime have been reported recently. In our country, the two backbone devices, the HL-1M and the HT-7 have worked for many years in this area. The other two large Tokamaks now in building, the HL-2A and the HT-7U will also work on such subjects. Theoretical study of LHCD had been carried out for years and now there are several codes to simulate the deposition of the wave power and the current