According to several studies from 2013-2019, many children in Yogyakarta do not understand Javanese vocabulary, especially krama level. Javanese vocabulary should be introduced to children from an early age. The vocabulary introduction is helpful for children to expand their knowledge and familiarize themselves with the language so that when children move to elementary school, they will have no difficulty following Javanese lessons. Access to the introduction, government policies, and media are still limited. The picture book is a close medium for children. The availability of an easy and attractive picture book to introduce Javanese vocabulary is still lacking. So, the study aims to define and design an easy and attractive lift-a-flap picture book about the Javanese vocabulary for children in Yogyakarta. This study is design-based research uses a mixed method with literature studies, interviews, observations, and surveys. The design process uses the design thinking stages, includes empathize, define, ideate, prototype, and test. The respondents are the DIY Language Center, teachers, and parents. This study conducts in several stages: 1) literature study to deepen theory, 2) interviews with the DIY Language Center and teachers to identify problems and needs for vocabulary introduction through a picture book, 3) perception surveys of parents to design picture book, 4) observations to find out the picture book trends, 5) data analysis, and 6) design the concepts and visualization. The result is a Javanese vocabulary picture book design for children 4-5 years through a lift-a-flap approach and automatic audio. This book provides visual, auditory, and tactile stimulation for children. This book encourages children to play with flaps and repeat vocabulary with the help of automatic audio. This repetition will make it easier to memorize Javanese words.