According to the needs of expression, choosing and adjusting synonymous forms is the most common rhetorical phenomenon in language. The core problem of effective use of language is the choice of various synonymous means. The synonymous forms of language include both fixed synonymous forms such as synonyms and synonymous sentences, and temporary synonymous forms that can be replaced with each other in a specific language environment without affecting their basic semantics. The communicative function of language expression first comes from the meaning of words that reflect people's understanding of objective things. Mastering and discriminating the meaning of words is the most basic condition to improve the effect of language expression. The correct use of synonyms is very important to improve the effect of language expression. The differences between synonyms are manifested in the severity or degree of meaning, and in the scope of meaning and the different objects of application. Synonyms often have different colors, so they are used in different situations. To choose accurately, we must distinguish the nuances of synonyms. Paper net teachers who graduated from www.bfblw.com should create all kinds of favorable conditions to help students accurately distinguish the differences between synonyms, so that they can quickly choose the most needed and appropriate words in the process of language communication. Content words and function words have different rhetorical effects, so we should make a correct choice according to the purpose, context and style. For example, to make people or things concrete and vivid, we should carefully choose verbs and adjectives. In order to make language expression accurate, decent and expressive, we must pay attention to the choice of sentence patterns. Some different sentence patterns can express the same or similar meaning. When choosing sentence patterns, we should not only consider the purpose and focus of speaking or writing, but also consider the sequential relationship between contexts and conform to the characteristics of style. Only when students know all kinds of sentence patterns well can they make appropriate choices. It is an indispensable link in rhetoric teaching to guide students to understand the structural characteristics of various sentence patterns and master their ideographic functions and rhetorical effects. The choice of synonymous forms also includes the choice of figures of speech and non-figures of speech, and the choice of this figure of speech and that figure of speech. Understanding and using figures of speech is one of the important contents of rhetoric teaching. Different types of figures of speech have different characteristics and functions, so we should understand different figures of speech in different ways, or understand their profound meanings through appropriate association and imagination. Or make a reasonable explanation of the sentence in combination with the context; Or according to the focus of semantics, the momentum of language, the coherence of language context and so on. Teachers should guide students to realize their own "meaning" and show their own "cleverness", so that students can constantly improve their understanding ability and appreciation level by appreciating other people's skills, and improve their application ability through imitation exercises.