Abstract: According to rigorous procedures, an experimental study was carried out to investigate the effects of jet exit velocity, flow direction, fluid subcooling and nozzle diameter on hysteresis of boiling heat transfer with impinging circular submerged jets of highly-wetting liquids. The experimental results showed that incipient boiling point decreased with increasing fluid subcooling and was independent of other factors, and that temperature overshoot enhanced with decreasing jet velocity and fluid subcooling. Corresponding explanations were given in view of boiling mechanism of highly-wetting liquid. At last, several means were listed to decrease or eliminate the hysteresis phenomenon of boiling heat transfer.