Fusing-off　temperature　of　thermal-link　matters　made　from　heat-sensitive　alloys　shows　probability　distribution.　The　fusing-off　temperatures　can　be　controlled　by　fusing-off　tolerance　through　designing　reasonable　composition　and　microstructure,　throwing　away　oxidic　film　and　increasing　surface　tension.　According　to　the　fusing-off　tolerance,　only　the　alloys　with　eutectic　composition　and　a　part　of　noneutectic　composition　with　near　eutectic　properties　can　be　used　to　prepare　the　thermal-link　matters.