Abstract: The friction factors and heat transfer characteristics of the flow of CFC-12 in micro triangular channels are studied. The experimental results show that the heat transfer in micro-channels is greater than that in normal scale channels, and the friction factors are smaller than that in normal channels. Most importantly,lots of bubbles are seen while CFC-12 boiling in the micro channels upon our experiments, which is different from the result got by others so far. It is explaied in this paper.