In recent years, segmentectomy has been widely adopted across centers nationwide and has gained consistent recognition for its efficacy in treating early-stage lung cancer. However, in clinical practice, solitary or multiple nodules located in challenging anatomical positions are frequently encountered, for which conventional segmentectomy may fail to ensure complete resection or achieve adequate tumor-free margins, often necessitating lobectomy and thereby compromising the preservation of pulmonary function. The split-segmentectomy technique removes the target segment in the central portion of a lobe by combining adjacent segments or subsegments, leaving the remaining lung tissue on both sides as two seemingly "disconnected" parts. This approach enables complete resection of pulmonary nodules while avoiding extensive lobectomy, thereby preserving as much normal lung tissue as possible. Preliminary clinical outcomes have been satisfactory, establishing it as a viable surgical option for pulmonary nodules in difficult locations. To standardize the application of this technique, promote its wider adoption, improve surgical quality, enhance procedural homogeneity, and reduce associated complications, this specification was developed on the basis of relevant literature and expert opinions from China. After thorough discussion and revision at an expert consensus meeting, a unified agreement was reached and formalized into the present specification.