Aphasia as a phenomenon of speech disorder has been dealt with starting from the second half of the 19th century. Aphasia, also known as aphemia, is a loss of the ability to produce and/or comprehend language, due to a local injury to brain areas specialized for these functions. It is an acquired speech disorder which is the incorrect use of previously correctly used language structures. While classifying aphasic patients one of the analyzed features is spontaneous speech. There are several methods of analyzing it depending on of what we want to learn about it. One of these methods concentrates upon the analysis of speech production, which reflects the location and the particularities of the problem. Their analysis can provide the possibility of handling problems of a certain level. I was allowed to work with some aphasic patients at Vac County Hospital, Hungary and Targu Mures University Hospital, Romania. I registered their speech and analyzed them by the aid of PRAAT, a special speech analyses computer program. I observed that aphasic patients pay more attention to their mistakes when speaking. The subjects of this study agreed to reanalyse their speech together and see if they can recognize their mistakes, become aware of them and by this improving their condition. This study shows that even in sever cases of aphasia speech analysis can help therapists in their effort to improve patients’ speaking skills.