This study was aimed at obtaining an ideal gold alloy for dental prothetic. The experiment was on physical characteristics of gold alloy and mixing proportion for proper appliance to living tissues. The most frequently used material in the past for dental prothetic was gold, but recently used are mictures or precious metals and non-precious, which are proved to affect on oral tissues. The experiment was to examine gold alloy over its physical and chemical qualities and to make an ideal type of gold alloy by means of statistic and laboratory research.