The southwest region has been a place where many ethnic groups live since ancient times. In addition to the Miao and Dong people in Qingshuijiang, Guizhou, there are also Maonan, Zhuang, Mulao and Bai people in Guangxi and Yunnan. Minority contract documents. Most of the contract documents in these minority areas are derived from the reference and transformation of the mature documents of the Han. This article attempts to use collating methods such as collation, field investigation, etc., to examine the relative terms “X” “血X” “品㙮肥磽” “薅修管業” “坐屋” and “前廈”. One is to supplement the missing words in the "Chinese Dictionary", and the other is to reveal the national and folk characteristics of contract documents in the southwest region, hoping to provide a reference for the correct interpretation of the documents.

According to the theory of cognitive linguistics, the human body experience is the basis of human cognition of the world, the starting point of cognition and the tool of cognition. Feet refers to the lower part of the human body and some animals that touch the ground, and are important weight-bearing organs and movement organs of the human body. Chinese and Korean "foot" words are the core vocabulary in both Chinese and Korean languages. This article mainly studies simple words and compound words composed of Chinese and Korean “foot” morphemes, and divides their semantic image features into two types: “structural meaning” and “functional meaning”. “Structural meaning” refers to the synthesis of “shape, location, and composition”, and “functional meaning” refers to the grammatical functions of the body parts themselves, the semantic functions of human words, and part of speech functions. Through comparative analysis, the similarities and differences between them can be found, in order to provide effective and credible semantic examples and theoretical research basis for teaching Chinese as a foreign language, teaching Korean as a foreign language, Chinese-Korean human lexics, and Chinese-Korean bilingual translation.

Research method of 3‐syllables chinese word in 21st century has the following characteristics：the comprehensive description and in‐depth explanations are combined with each other, the same ‐time and along‐time study are mutually permitted, the qualitative and quantitative analysis are combined research thought of these changes breaks new ground for theoretical and applicational research on 3‐syllables word.

Research method of 3‐syllables chinese word in 21st century has the following characteristics：the comprehensive description and in‐depth explanations are combined with each other, the same ‐time and along‐time study are mutually permitted, the qualitative and quantitative analysis are combined research thought of these changes breaks new ground for theoretical and applicational research on 3‐syllables word.