In recent years, many Vietnamese and International researchers have been interested in two aspects of Vienamese variant Chinese charaters – International variants and national variants. International variant characters here are Chinese characters originating from China. National variant characters are Chinese characters created by each country under the Chinese cultural influence, such as Vietnam, Korea and Japan. In order to clarify the charateristics of Vienamese unique variant Chinese charaters (national variants), we analyzed two Buddhist texts: The first one is Chư phẩm kinh 諸品經 (there are 187 variant Chinese charaters correspond to 183 standard charaters with total number of appearance is 1,697); the second one is Thích thị bảo dỉnh hành trì bí chỉ toàn chương 釋氏寶鼎行持秘旨全章 (there are 56 variant Chinese characters correspond to 41 standard characters with total number of appearance is 243).