To date Cheng Chih-jen has written 60 to 70 songs, mostly in Taiwanese, on such themes as affection for native soil, family, and the natural world. Among them, children's songs about Taiwan's endemic animals, plants and insects are very popular with youngsters, and are widely taught in Taiwanese elementary schools.
鄭智仁目前作品已累積六、七十首，創作以對土地、親情、自然界情懷的台語歌謠為主，其中主題為台灣特有動、植物、昆蟲的童謠更深受兒童的喜愛，在台灣小學普遍被教唱。