The point of this thesis is about surveying the uses of language in a Taiwanese-Japanese marriage family and the awareness about language of their parents, and then understand the Chinese language and Japanese language learning of their children. Survey method is based on questionnaires and then interviews. After surveying, the result shows most cases that Taiwanese mothers raising their children in Japan, their children can only communicate in Japanese. And then based on the question "Why learn Chinese after grow up?", more than half of the answers are "there's an advantage in job hunting with Chinese ability". In another case where parents educate their children with their own native language, most of the cases shows that although these children can communicate normally using both languages, but due to the less usage of the languages, they have problems in reading and writing. Most of them are not satisfy about their Chinese language and Japanese language ability, this applies to those who uses Chinese and Japanese as their native or those who voluntary uses Chinese and Japanese as their secondary language. This means that there a lot of people are not satisfy about their ability at the moment and they have motivation for improvements.