Abstract
Objectives This analysis deals with nine English I textbooks for the 2015 revised curriculum. We investigated the lexical and syntactic features of the text in the listening section activities.
 Methods To verify lexical features, the quantity of vocabulary words, vocabulary types, and terms with high frequency by publisher were verified, as well as the figures of lexical variety. The average word length and sentence length for each textbook, as well as the high frequency of frequent exposure, were studied in order to analyze the syntactic features. Each textbook's English listening section was compiled as a corpus file for each chapter, and the findings were analyzed by the WordSmith 7.0 tool.
 Results A total of 26,671 vocabulary words were collected, and 3,569 corpus types were identified. The lexical features revealed that among the nine textbooks in the listening section activity, the textbook with the largest vocabulary contained approximately 4,000 words, while the textbook with the least vocabulary contained about 2,000 words. In nine textbooks, the percentage of verbs and nouns was fairly high. The average length per word was 4.11, and the average length per sentence was 8.23, as a result of the syntactic features.
 Conclusions It will be important to provide suggested basic vocabulary independently, as well as to alter so that there is no significant variation among textbooks. Furthermore, it implies that teachers may grasp the variations in the textbooks and resolve learning deviations with supplemental materials for learners to use.
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