This study aims to find out how to understand the urban art that communicate visually through a mural Polo Triuns. The basic theory used in this study adopts from Peirce, which states symbol is a process to interpret and describe an object in the form of images. The question in this research is why people can not understand the urban art through the works of visual communication. The method used is descriptive method qualitative with data collecting observations and data collection from the source. Researchers are also using purposive sampling technique, the technique of sampling data sources, through social media. This research was conducted in Semarang with research subjects are artists and teachers Joko Riyatmoko (Polo Triuns), complete the thesis within a period of less than 4 months, and in doing thesis using qualitative research methods. Comprehension concluded that the urban art in visual communication where researchers got results in a work of urban artists have produced good meaning of icons delivered and textual delivered.