I. By spinning process
　　Combed yarn: The yarn is spun by combing process. Compared with combed yarn, it has better material, straight and parallel fibers, good yarn quality and fine yarn fineness.
　　Rough combed yarn: Yarn spun by the general spinning process. Also called combed yarn, cotton and wool spinning is slightly different.
　　Second, according to the length of the fibers that make up the yarn
　　Filament yarn: One or more continuous filament yarns formed by merging, twisting or deformation process.
　　Short fiber yarn: Short fiber is twisted and spun into yarn with a certain fineness, and can be divided into three kinds.
　　Cotton-type yarn: Yarn made from raw cotton or cotton-type fibers processed by pure spinning or blending on cotton spinning equipment.
　　Medium-length fiber type yarn: made of medium-length fiber processed on cotton spinning or special equipment.
　　Wool type yarn: Yarn made of wool fiber or wool type fiber processed by pure spinning or blending on wool spinning equipment.
　　Filament short fiber combination yarn: Yarn spun by short fiber and filament using special method, such as core yarn, wrapped yarn, etc.
　　Third, according to the composition of the yarn fiber type
　　Pure spun yarn: Yarn spun with one kind of fiber is called pure spun yarn. It is named with the word "pure" and the name of the fiber, such as pure polyester yarn, pure cotton yarn, etc.
　　Blended yarn: Yarn spun with two or more fibers. The naming rule of blended yarn is: when the ratio of raw material blending is different, the proportion is larger in front; when the proportion is the same, it is arranged in the order of natural fiber, synthetic fiber and regenerated fiber. When writing, the proportion of raw materials and fiber types together, raw materials, the proportion between the semicolon "/" separated. For example, polyester/cotton (65/35) yarn, wool/acrylic (50/50) yarn, polyester/viscose (50/50) yarn, etc.
　　Cross-twist yarn: Yarn made by twisting two or more different fibers or different colors of single yarn.
　　Blended yarn: Yarn made by combining two kinds of filaments to improve the performance of certain aspects.
　　By dyeing and finishing process
　　Primary color yarn: Yarn that maintains the original color of the fiber without any dyeing process.
　　Bleached yarn: Yarn with bleaching process and white color. Usually refers to cotton yarn and hemp yarn.
　　Dyed yarn: Yarn with various colors after dyeing process.
　　Color spun yarn: Yarn spun from colored fibers.
　　Burnt yarn: Yarn processed by burnt wool with a brighter surface.
　　Mercerized yarn: Yarn processed by mercerization, there are mercerized cotton yarn and mercerized wool yarn. Mercerized cotton yarn is treated with a certain concentration of alkali to make the yarn have a general luster of silk and higher strength; mercerized wool yarn is to remove the scales of the fibers in the wool yarn to make the yarn soft and too irritating to the skin.
　　V. Divided by yarn thread density
　　Cotton type yarn is divided into coarse special (No.) yarn, medium special (No.) yarn, fine holding (No.) yarn and extra fine holding (No.) yarn according to thickness.
　　Coarse special yarn: It is yarn with thread density of 32tex or more.
　　Medium special yarn: Yarn with a thread density of 31~21tex.
　　Fine special yarn: Yarn with a thread density of 11~20tex or more.
　　Extra-fine special yarn: Yarn with a density of 10tex or less.
　　Sixth, according to the structure of yarn appearance
　　Yarn is composed of textile fiber, with certain mechanical properties, fineness and softness of the continuous long strip.
　　The so-called "yarn" is actually a generic term for "yarn" and "thread", which is generally defined as: yarn is a continuous thread-like object made of various textile fibers, which is fine and soft. Yarn is a continuous thread made from various textile fibers, which is fine and soft, and has the basic properties needed to adapt to textile processing and end product use. Yarn" and "thread" are also often defined separately in the textile, that is, "yarn" is a number of short fibers or filaments arranged in a near seemingly row state, and twisted along the axial rotation, composed of a product with a certain strength and density. A "yarn" is a product of two or more single yarns twisted together to form a product with a certain strength and density, while a "thread" is called a line or strand.
　　Yarns can be classified into different types according to different bases. There are 10 types of yarns according to their structural appearance.
　　Monofilament: refers to a long length of continuous single yarn.
　　Compound yarn: A bundle of two or more monofilaments joined together.
　　Twisted filaments: compound filaments are twisted to form yarns.
　　Compound twisted yarn: twisted filaments are combined and twisted one or more times to form compound twisted yarn.
　　Deformed yarns: Chemical fiber yarns are deformed to give them curls, spirals, loops and other characteristics. The purpose of the process is to increase the fluffiness stretchability and elasticity of the maker. According to the performance characteristics of the shape-taking place, there are usually three kinds of elastic yarns, bulky yarns and network yarns.
　　Single yarn: A single continuous long strip formed by spinning short fibers.
　　Strand: Two or more single yarns are combined and twisted to form. If two single yarns are combined, they are called double strands, and three or more are called multiple strands. The strands are then combined and twisted to form a double twisted strand.
　　Fancy yarn: A yarn with special appearance and color made by a special process, including fancy yarn and fancy decorative yarn. It is formed by twisting core yarn, decorative yarn and solid yarn on fancy twisting machine, with special appearance form or color such as fiber knot, bamboo knot, ring, braid, spiral and wave on the surface.
　　Bulky yarn: Bulky yarn is a voluminous yarn with high looseness processed by using the heat shrinkage (thermoplastic) of prolene fiber. The yarn is made by mixing low shrinkage properties with high shrinkage properties of liposomal fibers in a certain ratio and then relaxing to heat set the shape. In this way, the high-shrinkage fibers shrink a lot and form a yarn core, while the low-shrinkage fibers shrink less and are squeezed on the surface to form an arc, thus making a fluffy yarn.
　　Cored yarns: Yarns made from filament or staple fiber yarns with other fibers or yarns wrapped around the core.