Based on the interview with an English teacher at SMK Negeri 1 Kelayang, the textbook used by the teacher to teach English is “Forward an English by Erlangga 2017”. In relation to the students’ understanding of texts, Parekeme and Abgor (2012) state that one of the factors determining students’ understanding of a text is text readability. Thus, this becomes the reason that the researcher decides to conduct this study on analyzing the readability level of selected reading texts in the English Zone textbook for the tenth grade of senior high school students by Penerbit Erlangga to see their readability level. The purpose of this research is to know the readibility level of English Textbook used at the second grade of SMK Negeri 1 Kelayang. There were 25 students as samples of this research. This research used content analysis method with quantitative approach. In collecting the data, the researcher distributed a test called Cloze test. The result was the mean score of the Cloze test was 18. Based on the judgement of the students’ readibility level, the score below 40 is classified as frustration level. In conclusion, that the English textbook at second grade students of SMK Negeri 1 Kelayang is not appropriate for the students.
                        
                        
                        
                        
                            
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