This research aimed to increasing ability to know about the letters through big book as a media for children age 5-6 years in TK Mutiara Kasih of Bunut Subdistrict of Pelalawan Regency. The subject of this research are 16 children in group B of TK Mutiara Kasih. The method of this research is Classroom Action Research conducted as much as 2 cycle, in each cycle consist 4 stages namely planning,…