Bansal et al. have reported that the LiKSO4 crystal undergoes a subtle structural phase transition at 201K while being cooled according to the temperature dependence of Raman spectrum intensity for some polar phonon modes. They found the low temperature phase to be C3v4. But their evidences were not enough. In the present work we report further refined Raman spectra in LiKSO4 at both 210K and 203K. After carefully analysing their variations and considering the correlation of space group symmetry, we were convinced that tlie pattern of tiie structural phase transition in LiKSO4 at 203 K is while being cooled. This phase transition seems to be associated with a rearrangement of two adjacent SO2 tetrahedra in the unit cell.