In Taiwan, Mandarin is official language, so Mandarin is regarded as a language capital advantage of occupational achievement. Many common-used linguistic proficiency is highly correlated with ethnicity. Literature with relevance to the education achievement or the professional status caused by ethnic difference, will frequently attribute the ethnic net effect to the difference of language capital after controlling the basic family background variable. However, because suitable materials with the proof of the influence of language capital is rare except Tsai’s paper (2001), nearly no other literature thoroughly discusses the role of language capital in occupational achievements caused by ethnic difference. What role does the official language ability play in occupational achievements? In addition, does other language abilities can also be called language capital? Does it have any superiority?

Taiwan Education panel survey (TEPS) has rich information about several languages’ proficiency, and this research uses this specific database, and then decide to use multicategory logit regression analysis to explore the role of language capital in professional status achievements. We obtains the following conclusions: (1)the Minnan ethnic group’s average official language ability is apparently worse than other ethnic groups; the provincial ethnic group’s English ability is better than other ethnic groups. But, after controlling the official language and English fluency, the difference of occupational achievements between the provincial and the Minnan ethnic group no longer exits; (2) the difference of occupational achievements between the Hakka and Minnan ethnic group does not exit, because the Hakka’s average official language ability is better; (3)language capital has great influence to lower education persons who want to find a job in the public sector; but even with the same language ability, the provincial ethnic group still has a bigger opportunity to enter the public sector; (4) compared with the Minnan ethnic group, the Hakka and the provincial ethnic group has less opportunity to become the small employer, so the Minnan language ability will be the principal factor to explain why they have the advantage to become the small boss; once the provincial and the Hakka ethnic group no longer employed can speak the Minnan language, they also have the same opportunity to become the small boss; (5) the official language and Minnan language ability all have the positive influence for "the big employer" who does need a good business connection (social network), and they become good instruments for the accumulation of social capital; (6)the official language, the Minnan language or English all have significant influence to the household income.