This article is devoted to the disclosure of the content of the correctional work of a speech therapist in violation of written speech with children with general underdevelopment of speech. The purpose of the article is to show the effectiveness of speech therapy work aimed at correcting dysgraphia of children with speech disorders. The increase of the growth of children with speech impairment in recent years indicates the relevance of this problem and the need to provide corrective assistance from teachers and a speech therapist. Untimely detection and correction of dysgraphy associated with speech underdevelopment prevent the full assimilation of the curriculum and the comprehensive development of the pupil. Research method. The author presents research data obtained using the diagnostic technique of O.B. Inshakova, which allows specialists to identify a violation of the written speech of younger schoolchildren and the degree of its severity. The methods of work of the teacher are also proposed, which increase the effectiveness of the correctional work of written speech in children of primary school age with speech disorders. Research results. The control experiment showed that the number of dysgraphic errors in children of primary school age with general underdevelopment of speech decreased by 35%. Conclusions. The results of the study of the written speech of younger schoolchildren indicate the need for the use of corrective work by a speech therapist, which should be focused on the development of phonemic hearing, sound pronunciation, sound analysis and word synthesis skills, it is also necessary to expand and enrich the child's vocabulary.