Abstract: The paper first briefly analyzed the key points of the production process of super-fine sirocompact-spun yarn, and then taking siro-compact spun yarn in 7.3 tex and 5.2 tex as examples, it points out the process requirements and cautions for solving the thin-place problem of such yarn based on introducing the principle of siro-compact spinning, production process and how to optimize product quality.

Key words: raw material; fineness; siro-compact spinning; quantitative; quality