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Semi-open heat pipes were studied experimentally in this work. A new kind of semi-open heatpipe with fluid swirl backflow was developed on the basis of the traditional semi-open heat pipe. Heat transfercharacteristics during operation and start-up of closed heat pipe、traditional semi-open heat pipe and swirl flowsemi-open heat pipe were investigated. The swirl orifice s backflow effect on enhancing the working limitationwas obtained. Heat exchangers or waste heat boilers made of swirl flow semi-open heat pipes and semi-openheat pipes have been successfully used in high or variable gas temperature engineering applications.