A constraint chain piece, a chain, a chained stepless speed regulator, and a chain design method. The constraint chain piece (2) is a combined body by integrally connecting two chain pieces with a constraint connection region (4), and implements clamping and constraint for the adjacent chain piece. The constraint chain piece (2) and a transmission chain piece (1) are alternately assembled at a spacing, so that the whole chain are integrally connected at the outer side, thereby constraining the outer-side chain piece; for the manufacturing process, the chain without a welding spot and a riveting spot omits the conventional welding or riveting process, thereby reducing the manufacturing cost, improving the reliability, and prolonging service life.
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