The emphasis is laid on expanding students'vocabulary in the new English Curriculum Standards. Without effective ap?proaches to vocabulary learning, students can hardly form vocabulary networks in mind. Combining with modern educational tech?nology, the author carries out experimental teaching to explore the effectiveness of vocabulary teaching based on prototype category theory and presents some samples of vocabulary teaching. The study shows that these teaching methods can effectively enhance stu?dents'cognition abilities, stimulate association, promote vocabulary processing, form a categorized network schema, and finally im?prove students'lexical competence and long-term memory.