This article presents a descriptive investigation about the relation between previous knowledge and generation of reading inferences in deaf people. They analyzed the reading comprehension of 4 deaf people between 20 and 23 years old, educated and with not less than 10 years of exposition to Spanish read and written as second language. They are exposed to narrative texts, in the first place a narrative example is contributed to generate previous knowledge of the subject matter and is exposed to the text evaluated, subsequently is exposed to another text of different subject matter. The method of free memory is utilized and instigation through questions. The results show that the most important factor for the generation of inferences is not the previous knowledge of the treated subject matter but the training and comprehension of the type of questions.