The current study focuses on the outstanding role of speech processing in the processes of reading and learning of reading. Its importance and actuality are the shaping attitudes of the special needs teachers because the study shows the causes of certain symptoms. We searched for the answer to the relationship between the speech and reading processes of 3rd and 4th-grade children with mild intellectual disabilities. We touched upon the aspects of perception, the functioning of text comprehension compared with sentence comprehension, and the different levels of reading. The experimental group consisted of 26 pupils and the control group consisted of 25 children. Both of the researched areas were studied by standardized methods: the speech process was studied by GMP-diagnostics and the reading by the reading paper of Meixner. The results show the serious delay of development of every studied level of speech processing which causes remarkable difficulty in the quality of reading and reading comprehension. All this information draws attention to the necessity of prevention and the development of speech perception in education.