This policy was then adopted nationwide across China and contributed significantly for the nation food supply during World War II.

In this position, Yen became known as "father of the New Taiwan dollar," as the currency was introduced in June 1949, during his tenure at the bank.

[13] In December 1974, Yen traveled throughout Central America and the Caribbean, during which he attended the inauguration of Anastasio Somoza Debayle, who was starting his second stint as President of Nicaragua.

[5] During his presidency, the Kuomintang worked on the "Chang'an Project" (長安計畫), which was to design, manufacture, and test defensive missiles.

[19] Though he wished to resign after leaving the presidency, the organization's bylaws were amended so that Yen could retain the post.

He suffered a second brain hemorrhage in 1992 and died at the Taipei Veterans General Hospital on 24 December 1993 the age of 88.