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The purpose of this study is to evaluate Yun Chi-ho’s diary and investigate a change in his writings over time. To achieve the goal of this study, T-unit analysis was initially adopted to ascertain the average length of the T-units, the ratio of clauses per T-unit, and the ratio of error free T-units, and to measure the sentence maturity. Secondly, TWE holistic evaluation was implemented to demonstrate clear writing competence on both the rhetorical and syntactic level. Thirdly, a TEEP analytic evaluation was initiated to demonstrate cohesion, adequacy of vocabulary, grammar, and spelling. Fourthly, an error analysis was used to investigate the accuracy development by checking error types and frequency. Finally, type-token ratio analysis was employed to measure capacity to diversify the vocabulary. From the T-unit, TWE and TEEP evaluation, Yun Chi-ho’s diary was evaluated as exhibiting high maturity with simple sentences. According to the results of the error analysis, Yun Chi-ho’s diary contained an average of two errors per one diary, while the structure were almost perfect. As the number of errors was reduced, it can be considered there was a relative development in accuracy. Type-token ratio was 35% on average; this result could be interpreted to mean that Yun Chi-ho’s diary exhibited a high level of vocabulary richness. In conclusion, The evaluation results fluctuated from 1890 to 1943, but they sustained high quality on aspects of sentence maturity, grammatical accuracy, and vocabulary diversity.