Ensuring the mechanical properties of steel reinforcement bars (rebar), particularly yield strength, is a critical quality control step in construction projects using Chinese-manufactured rebar. Yield strength signifies the stress level at which the material begins to deform plastically. Verification confirms the rebar meets the specified grade (e.g., HRB400, HRB500) as per Chinese standard GB/T 1499.2 or equivalent project specifications. The primary method for verification is the destructive tensile test, performed on a universal testing machine. The process begins with sample preparation. A representative section of the rebar is cut and machined, if necessary, to fit the testing machine's grips. Precise gauge marks are placed on the sample to measure elongation. The sample is then mounted in the testing machine, which applies a continuously increasing tensile force until the specimen fractures. During this test, the machine's software records the applied force and the corresponding elongation, generating a stress-strain curve. Identifying the yield point on this curve is key. For rebar with a pronounced yield plateau, the yield strength is the stress at the lower yield point. For materials without a clear plateau, the 0.2% proof stress method is used. This involves drawing a line parallel to the elastic portion of the curve from the 0.2% strain point on the x-axis; the stress where this line intersects the curve is the yield strength. The calculated yield strength value is compared against the minimum requirement for the rebar's grade. A verified result equal to or greater than the specified value confirms compliance. It is essential that testing is conducted in accredited laboratories following standardized procedures (like ISO 6892-1 or ASTM A370) to ensure accuracy and international recognition. Proper verification safeguards structural integrity, prevents material failure, and ensures the safety and longevity of concrete structures. Regular batch testing, coupled with certification review (Mill Test Certificate), forms a robust quality assurance protocol for Chinese rebar in global construction.