The heat does not just provide comfort and have a placebo effect. It actually deactivates the pain at a molecular level in which the same way as pharmaceutical pain killer. The present study aim to assess the effectiveness of hydrotherapy on pain perception and labour outcome among 200 primi parturient mothers who fulfilled the inclusion criteria were selected for the study. Visual Analog Scale and partograph was used to assess the pain perception and labour outcome. The warm shower at 37-degree C was showered hourly 15 minutes from 4cm to 8cm cervical dilatation. The overall mean level of pain perception was 3.98 with SD 2.12. The unpaired t =10.081 which is statistically significant at p<0.001. With regard to duration of labour and the maternal injury , the mean was 9.44 and 0.25 with SD of 1.32 and 0.43 respectively. The t value for duration of labour and maternal injury was t=7.535 and t=7.800 respectively which is statistically significant at p<0.001. Thus hydrotherapy is an evidence based care for reducing the pain perception during labour and improving the labour outcome.