This research is a qualitative descriptive study. The comparison between the two school language textbooks is interesting because it involves two different cultures. The aim of this study is to describe the types of genre of the reading texts available in school textbooks and to explains how the experiential function is realized through the transitivity analysis. According to Martin (1992), Genre can be divided into two: 1) the factual genre genre produced by reality, and 2) fiction genre produced by imagination. This paper attempts to compare the genre of the reading texts in both Indonesian and English textbooks, used in primary school by using the theory of SFL. Systemic Functional Linguistic (Halliday, 1994) sees text as the construction of a social system as well as the cultural context where it is produced, realized through genre. Texts available in the school textbooks serve as linguistic models, media to cultivate values and norms in society and also the source of knowledge.