This study aims to analyze the use of the Abacaga book in developing literacy skills of children aged 5-6 years at SPS Flamboyan 1 Bekasi City. Literacy skills are fundamental abilities that serve as the foundation for children's future academic success. This research employed a descriptive qualitative approach with data collection techniques through interviews, observations, and documentation. The research subjects consisted of five teachers directly involved in teaching using the Abacaga book. Data analysis was conducted using the Miles & Huberman model through data reduction, data display, and conclusion drawing. The results showed that learning planning was carried out systematically through daily lesson plans adjusted to children's developmental stages. Evaluation was conducted authentically through direct observation and portfolio assessment. Collaboration between teachers and parents proved to be a key success factor in implementing the Abacaga book. The advantages of this book lie in its attractive visual design and systematic gradual approach, while its limitations include limited book availability and activity variations. Challenges faced include differences in children's abilities, time constraints, and lack of parental involvement, which can be addressed through creative approaches and intensive communication. This study concludes that the Abacaga book is effective in developing early childhood literacy skills, provided it is supported by thorough planning, continuous evaluation, and close collaboration between teachers and parents.