This study presents an experimental investigation of evaporation local heat transfer characteristics of CF₃I in a vertical brazed plate heat exchanger. To do this a test section which contains a total of 8 stainless steel plates is designed to measure the local heat transfer coefficient of the refrigerant. Two of them were constructed herringbone for the refrigerant flow channel the other two flat plates are processed for the cooling plate for the refrigerant, and the another is for the cooling water flow channel. To measure the local heat transfer coefficient, 20 thermocouples were set in the test section. These 20 thermocouples are installed to measure the refrigerant wall temperatures, water side temperature and saturation temperature of the refrigerant. Recording these measurements makes it possible to calculate the local heat transfer coefficient at different positions in the test section. The refrigerant flow channel and the water flow channels are countercurrent in the test section. The refrigerant flow channel is in the middle, and it is sandwiched by two water channels from the outside. In evaporation, the flow direction of the refrigerant is upwards in the test section. The experiment was carried out in the condition of vapor qualities from 0.0 to 1.0 at a certain saturation temperature and mass flux. In the evaporation experiment, the local heat transfer coefficient indicates the maximum value near the refrigerant inlet position and the minimum value at the end face position of the cross-section of the channel with the same phenomena as [1] for pure R32. The heat transfer coefficient for mass flux 50 kg/m²s is almost 1.2 times higher than that for mass flux 20 kg/m²s at high quality vapor.