The utility model is suitable for a heat transfer unit (HTU) field provides a vapor chamber, vapor chamber includes the casing, with go up the lower casing that the casing cooperation was used, go upthe casing with be provided with condensation part on the contact surface of lower casing, the one side of going up the casing is provided with the notes liquid mouth that is used for pouring into thecoolant liquid, down the casing with be provided with evaporation portion on the contact surface of last casing. The problem of the not good technique of heat dissipation is solved.