Media is very important in ongoing learning activities, especially in early childhood education, educators are required to use the media when delivering material or when learning takes place. Preliminary study in TK Yayasab Islam in group A that learning media is used every day by teachers. The media that is often used to introduce letters of the alphabet to children is the poster attached to the classroom wall. Media used in kindergartens should be media that can be used or played directly by children, so that children have new experiences and can train the concentration of children. The results of identifying and analyzing the problem, the researchers followed up by designing the alphabet big book media as a solution to improve the ability to recognize the alphabet letters of children aged 4 sd 5 years. In this study using the Design Based Research (DBR) method developed by Amiel and Reeves to design, develop, and test the feasibility of a product to overcome problems in learning. The main ingredient of the product is designed using fiber measuring 50 x 37.5 cm, then the fiber is coated by blue, yellow and flannel motifs. A preliminary study of this research was conducted at the Islamic Foundation Kindergarten. Data collection was only done by interviews and expert validation, this was due to the Corona Virus Disease pandemic (COVID-19) so that researchers could not continue product trials in the field. The product design was declared feasible by the three expert validators, then revised according to the suggestions and recommendations of the expert validators. In general, the product is declared suitable for use as a learning medium about the ability to recognize letters of the alphabet of children aged 4 to 5 years.