Communication through poster text is an alternative in conveying information, including in the type of nonverbal speech act. These posters are often found, especially on the outskirts of Palu City. However, the researcher limited it to poster texts about the prohibition of littering in the border areas of Palu City. The poster text contains narratives and dictions that can be read by both pedestrians and motorists passing by. The purpose of this study is to determine the narrative and dictions in the form of illocutionary speech acts in poster texts about the prohibition of littering in the outskirts of Palu City based on semantic and pragmatic meanings. The research method is descriptive qualitative, namely a method that describes data according to reality. The research data is in the form of poster texts about the prohibition of littering in the outskirts of Palu City. The data source is written speech (narrative and diction) contained in posters made by the local government from early 2024 until now. From the study of semantic and pragmatic meanings, it is described that poster texts using illocutionary speech acts have an impact on public awareness because this form of text not only conveys information, but also has the purpose of attracting attention, forming memories, binding, and influencing readers because the message is clear and firm.