in this research tofu prepared using acid coagulant had lower yield than prepared by salts. According to Utami (1990), the smaller weight molecules possibly released into whey, indeed during pressing step in tofu-making. Moreover, during coagulation process salts coagulant was able to formed protein molecule bound through compleks Ca-protein bound, thus among molecules might be associated together to be aglomerat which caused the molecules not easy to be released.