In　order　to　improve　the　unsteady　high　temperature　heat　transfer　performance　of　receivers　in　solar　thermal　power　stations　the　receivers　should　be　optimized　further.　High　temperature　could　help　to　optimize　heat　transfer　of　the　receiver.　Based　the　selection　of　heat　pipes　and　bromides　this　work　prepared　six　samples　of　quaternary　bromides　with　different　composition　ratios　of　KBr,　LiBr,　NaBr,　and　CaBr2　and　their　density　and　surface　tension　were　measured　and　analyzed.　Experimental　results　show　that　density　of　quaternary　bromides　shows　very　good　linearity　with　salt　temperature,　and　density　of　quaternary　bromides　is　higher　than　that　of　Solar　salt　at　a　same　temperature.　Also,　quaternary　bromide　NO.2　has　maximum　density,　and　quaternary　bromide　NO.3　has　minimum　thermal　expansion　coefficient　while　quaternary　bromide　NO.6　has　the　minimum　density　and　maximum　thermal　expansion　coefficient　at　the　same　temperature.　In　addition,　quaternary　bromide　NO.1　has　a　maximum　surface　tension　and　fitting　curve　slope　at　a　same　temperature　among　the　six　samples　of　quaternary　bromides.　Their　density　and　surface　tension　were　fitted　with　linear　fit　with　their　temperature　respectively.　Furthermore,　that　the　composition　ratio　has　evident　influence　on　the　density　and　surface　tension　of　quaternary　bromides　has　been　concluded.　(C)　2016　Elsevier　B.V.　All　rights　reserved.