語言與認知相互依存，是個體認知發展的重要憑藉，也會成為其行為的指引。語言學用，建基於口語能力，國民小學階段為語言學習黃金時期，應落實培養學生正確、適當、合理、流暢、靈活的口語表達能力。然囿於國民小學國語教學現況，口語表達教學未能落實。對此，研究者期望能提出改善之道，以實施十二年國民基本教育新課綱的契機，於國民小學階段落實培養學生良好的口語表達能力。因此以臨床教學的質性研究模式，以國小四年級學生為研究對象，進行十週兩部分的口語表達教學，由探究對其語音表現及組織表述的影響，提出研究結論及相關建議。

Language and cognition are interdependent; a language can be important for individual cognitive development as well as guiding behaviors. Learning and usage of a language are based on oral capabilities. As elementary schooling is a prime time for language learning, students should be cultivated with positive, adequate, reasonable, fluent and flexible abilities on oral expression. At present, however, teaching and learning of oral expression on Mandarin at elementary schools are not implemented properly. To this regard, the researchers anticipate a method for improvements, in view of grasping an opportunity during the implementation of new course outlines for the 12-year Basic Education, to develop students' good ability on oral expression at the stage of elementary schools. Hence, on the basis of a qualitative research model using practical teaching methods, we studied 4^(th) Grade students and conducted a two-part teaching on oral expression for a period of ten weeks. By exploring the effects on students' phonetic expression and organizational representation, we propose some conclusions and offer related suggestions.