To　improve　the　performances　of　solder,　rare　elements　Nd　and　Y　were　added　into　Mg-Al-Zn　based　alloy.　The　effects　of　elements　addition　on　the　properties　and　the　microstructure　of　solder　and　the　joint　were　investigated.　The　microstructure,　the　phase　compositions　and　element　components　were　analyzed　by　SEM,　EDS　and　XRD,　and　the　shearing　strength　of　joint　were　measured　by　MTS.　The　spreading　and　filling　performances　of　the　solder　were　also　measured.　The　results　indicated　that　the　microstructure　of　the　solder　were　improved　by　the　addition　of　rare　earth　elements　Nd　and　Y.　The　spreading　performace　of　the　solders　containing　Nd　was　better　than　Y,　and　the　highest　value　of　the　spreading　area　reached　129.3　mm2.　However,　the　performance　of　joints　containing　Y　was　higher　than　that　of　containing　Nd.　Joining　under　the　conditions　of　Ultrasonic　time　2s　and　welding　space　0.15　mm,　the　shearing　strength　of　the　soldered　joints　was　79.4MPa　especially　with　0.47%Y　addition.