The purpose of this paper is to report the results of an investigation of the evaporating heat transfer of refrigerant in the horizontal internal spiral-grooved tubes and the effect of heat flux,quality dryness and mass flow rate on local heat transfer coefficient.The existing correlations of heat transfer are compared with the author's experimental data and other investigators'data.It indicates Kandlikar's correlation has clearer physical concept. In order to improve its universality and computational precision,the way of improving Kandlikar's correlation is treated of in some detail.