The ability of students in writing skills still experiences errors in the use of letters, especially in the use of capital letters. This study aims to determine errors in the use of capital letters written by students in the form of descriptive paragraphs at UPT SD Negeri 71 Gresik through qualitative research methods. Research subjects consisted of 10 students of class IV. Data collection was obtained from observation and tests, with a triangulation collection technique. The results of the study of 10 students who wrote descritive paragraphs with five aspects of the intended indicators were 5 students with errors in the first letter of the beginning of the sentence, 4 students with errors in the first letter of the persons name, 6 students with errors in the letters first the name of the day and month, 4 students with errors on the first letter of the place name, and 3 students with errors on the first letter of the essay title. With the analysis of errors in the use of capital letters in descriptive paragraphs, it is hoped that students will be able to broaden their vocabulary and create written works that have good grammer.