This study was concerned with Japanese children's lexico-semantic development in English. Color terms were selected as the domain of this study. First, Japanese color names were elicited from subjects, aged 10 and 11 by asking them to write down as many color terms as they could think of within 30 seconds. The obtained: order of color terms was interpreted within the framework of Berlin and Kay's (1969) universal hierachy of color terms. Also, Miller and Johnson-Laird's (1976) "landmark-color" hypothesis and Rosch's (1973) "prototype" theory provided some account of the results. The same subjects were also asked to respond to the emotive tone of Japanese and English color terms. Some systematicity was observed in their responses. It was argued that the systematicity would be attributed to: (i) universal sensations inherent in a given color; (ii) cultural transmission; (iii) area-specific socio-cultural conditions, and (iv) idiosyncratic, personal experiences (cf. Hayakawa, 1953).