Some children are born with a problem in producing the actual speech which causes difficulty in expressing themselves and in using words together to communicate ideas. This problem may be a result of physical abnormality, cognitive grizzling or other developmental factors. They may substitute sounds which appear in their speech. Their errors may affect their personality and they may lose their confidence .This book is a theoretical.Also, an empirical attempt in the field of speech therapy. The theoretical part covers 3 main topics: the nature of articulation and phonological disorders in children, speech perception and its clinical application to speak remedially, and to envail the psychological impacts of the oral impairment on the child's attitudes. The empirical part of the study will be restricted to remediate the types of articulation and phonological disorders which are known as substitution errors pattern. The treatment-aim-sounds /θ, ð, ð,ʁ,χ, k, l, in English and Arabic are mispronounced by 6 samples who succeeded to utter the 7 sounds. The findings are that: the two treatment programmes: the motoric training and perceptual training. "CSL" is used for the results analysis.