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This longitudinal study examines the aspect of Korean vocabulary development as a Heritage language for Korean-America. In the first test which was conducted in 2012, among 53 children, 8 students showed normal development in receptive vocabulary, and 4 children showed normal development in expressive vocabulary based on the development of children in Korea. However, in the second test conducted in 2013, 39 children were tested among 53 children and only 2 children portrayed normal development within the receptive vocabulary. In the case of the comparison group in Korea, 48 children were given the same test and resulted as the following: receptive vocabulary (–7.179**) and expressive vocabulary (-12.362**). Within the first and second test, we have seen changes in vocabulary items such as ‘할아버지’ (grandfather), ‘이빨’ (teeth), ‘타다’ (ride), and etc., which are vocabulary that appear to be in the child’s life-community based vocabulary. This also portrays unstable vocabulary acquisition within the children. (Kyung Hee University)