This study aims to probe into effectiveness and influence of Wiki application on English learning attitude and writing competence of business administration talents in Taiwan. The study was based on research method of quasi-experiment, and the research period was one year. The subjects were 59 seniors in one university of technology in Taiwan. Research findings are shown as follows: (1) Wiki can enhance English writing learning attitude; (2) Wiki is effective to increase overall English writing competence; (3) Wiki can enhance wording /format, grammar and organization/content of English writing; (4) Wiki can effectively increase English writing organization/content competence of high and low learning achievement learners; (5) Wiki can improve wording /format competence of high and low learning achievement learners; enhancement of high learning achievement learners is higher than low learning achievement learners; (6) Wiki can effectively increase high and low learning achievement learners’ grammar competence, and the progress rate of low learning achievement learners is the most significant.
