A liquefied gas treatment system, comprising: a liquefied gas supply line connected from a liquefied gas storing tank to a source of demand; a heat exchanger provided on the liquefied gas supply line between the source of demand and the liquefied gas storing tank and configured to exchange heat between liquefied gas supplied from the liquefied gas storing tank and heat transfer media; a media heater configured to heat the heat transfer media; a media circulation line connected from the media heater to the heat exchanger; a media state detecting sensor provided on the media circulation line and configured to measure a state of the heat transfer media; characterized by a controller configured to set a gasification prevention reference value for preventing the heat transfer media from being gasified and change a flow rate of the heat transfer media flowing into the media heater or calories supplied to the heat transfer media by the media heater on the basis of a state value of the heat transfer media by the media state detecting sensor and the gasification prevention reference value; a phase separator provided downstream of the media heater on the media circulation line and configured to separate the heat transfer media which by a cracking phenomenon is generated into gas and liquid; wherein the phase separator is configured to discharge the gasified heat transfer media to the outside and supply the liquid-state heat transfer media to the heat exchanger through the media circulation line; and wherein the controller is provided for preventing the cracking of the heat transfer media, the phase separator is provided for preparing a case where the cracking of the heat transfer media is generated. a liquefied gas supply line connected from a liquefied gas storing tank to a source of demand; a heat exchanger provided on the liquefied gas supply line between the source of demand and the liquefied gas storing tank and configured to exchange heat between liquefied gas supplied from the liquefied gas storing tank and heat transfer media; a media heater configured to heat the heat transfer media; a media circulation line connected from the media heater to the heat exchanger; a media state detecting sensor provided on the media circulation line and configured to measure a state of the heat transfer media; characterized by a controller configured to set a gasification prevention reference value for preventing the heat transfer media from being gasified and change a flow rate of the heat transfer media flowing into the media heater or calories supplied to the heat transfer media by the media heater on the basis of a state value of the heat transfer media by the media state detecting sensor and the gasification prevention reference value; a phase separator provided downstream of the media heater on the media circulation line and configured to separate the heat transfer media which by a cracking phenomenon is generated into gas and liquid; wherein the phase separator is configured to discharge the gasified heat transfer media to the outside and supply the liquid-state heat transfer media to the heat exchanger through the media circulation line; and wherein the controller is provided for preventing the cracking of the heat transfer media, the phase separator is provided for preparing a case where the cracking of the heat transfer media is generated.