The main purpose of this study, which is composed of the theoretical framework, Functional Grammar model, is to examine the number, intensity and types of nominalization usage from the grammatical metaphorical perspective in the 3rd grade science textbook which was renewed in 2017 with the Science Teaching Program. Document review method was used in the research. Nominalization word types were determined and frequency of nominalization types were determined. In each unit of the textbook, the ratio of nominalization words to total words was calculated and the density of nominalization was found. According to this,-mAK attachment 175,-mA attachment 522,-DIK attachment 346,-(y) AcAK attachment 56,-(y)Iş attachment was used 31 times. Nominalization density is 7,37%. It can be argued that this study may contribute to a better understanding of the level of nominalization in primary school textbooks.