Textbook played important roles in English language teaching. An evaluation of English textbook was needed to make sure the appropriate of English textbook for students. The textbook should be not only value based on visual illustration but also based on their language feature. This research aimed to analyze the transitivity of genres that is used by English in focus textbook. This study used a descriptive qualitative design. The researcher analyses the types of transitivity analysis based on Halliday’s theory of systemic functional linguistics by using checklist worksheet. In collecting data, this study were collected from the reading section of some titles in the textbook of every genre. The researcher’s’ knowledge of transitivity system was the key instrument. As supplementary tools of the instrument, forms of data sheet were used during the research analysis. Besides, triangulation technique was used to get dependability of data through expert judgment. The researcher found that the characterized process types and participant function were material process (63,72%) and its participant named actor (27.54%) and goal (26.34%). It becomes the most dominance percentage of three genres by the textbook. Meanwhile, the characterized circumstantial elements is place-location (44.64%), which becomes the most dominance percentage. This finding is supported by Halliday’s theory.

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