Readers' letters is a kind of a rubric that appears in written media. This rubric contains the letters from the readers for the media itself, particular person or company, governement, or for readers in general. Besides bridging the relationship between the readers and the media, readers' letters also functions yo give the readers a chance to state their opinion. In My Opinion (IMO) in the jakarta Post is readers' letters in online form where the other readers can comment on the readers' letters online. Thus, they can communicate one another. The way the readers communicate their purposes in the IMO is an interesting phenomenon. This study aims at analysisng the rethorical structures of the IMO in the Jakarta Post on January 2011. Rethorical structure is the organization of ideas in a text that consists of stages or steps. These stages or steps are usually called Move. The method used in this study was qualitative method with genre analysis approach. The unit of analysis in this research was Move. A total of 17 readers' letters from IMO rubric of the Jakarta Post formed the data of the study. The result revealed that the rethorical structure of the readers' letters vary as the purposes also vary. It can be concluded that to achieve different communicative purposes, writers apply different linguistic strategies
