In fact, the process of steel bar turnover is that when the construction technicians calculate the quantity according to the drawings, they list the detailed steel bar processing list and draw the processing diagram. There are two specific ways: 1. Budget sampling refers to the sampling of steel bars in the design and budget stage, so as to calculate the content of steel bars in the drawings and use it in the budget and bidding of steel bars. 2. Construction template refers to the specification, shape, size, quantity, weight, etc. of the reinforced concrete structure listed in detail according to the drawings during the construction. In order to form a bill of materials for steel members, it is convenient for steel bar workers to make and bind steel members according to the bill of materials. The relevant requirements of reinforced bar sampling inspection with extended data are 1, which requires accurate calculation and meets the design and specifications. In addition to having certain mathematical knowledge and CAD foundation, we should be proficient in drawings, have a deep understanding of design intent and have a certain spatial imagination by using steel bar sampling software to calculate steel bars. 2, requirements conform to the actual construction, guidance and convenient construction. This requires familiarity with the construction site, rich perceptual knowledge and on-site practical experience. After all, it is quite obvious that practice produces true knowledge. 3. The requirements are reasonable. Not only can we find the unreasonable places on the drawings and optimize them, so that the model room is convenient for construction and conforms to the specifications, but also can save steel bars as much as possible, which is inseparable from long-term experience, technical accumulation and wisdom.