These include: (1) a system developed by the Qing dynasty's postal service in 1906 for communications with overseas postal authorities; (2) Gwoyeu Romatzyh, developed by Zhao Yuanren in 1928; and (3) the Yale system, developed in 1948 for teaching Chinese at the university level. The Yale system was once used extensively throughout the world in Chinese instruction.
此外，在台灣可見的拼音法尚有一九○六年清末郵政單位為與國外通訊而制定的郵政式，一九二八年由趙元任先生製定的國語羅馬字（注音符號第二式的前身），以及一九四八年美國耶魯大學為教授中文而製定的耶魯式，其中耶魯式拼音也曾在國際間的中文教學盛極一時。