In learning English, a person is required to master language skills. In the language skill itself, there are 4 components, namely listening skills, speaking skills, reading skills, and writing skills. Each of the skills mentioned has a very close relationship with one another. The four skills are basically a unit in learning a language. This research aimed to describe (1) the writing skill of descriptive paragraph before applying Mind Mapping, (2) improving writing skill of descriptive paragraph after applying Mind Mapping and (3) improving the ability to use word classes after applying Mind Mapping. The method and technique of presenting data in this research is in the description and table form so that it can be meaningful and well organized. The results showed that the last post-test in cycle II reached the indicators of success determined in this classroom action research. An increase in the ability to use word classes also occurred after the application of the Mind Mapping learning model, where in the first cycle students were able to write as many as 10 sentences in a paragraph and an increase also occurred in the use of words (adjectives), while in the second cycle there was also a significant increase. quite satisfactory where the participants were better able to write 12 sentences and were more creative by using more words such as nouns, adjectives, and verbs.
Keywords: descriptive paragraph, word classes, Mind Mapping