Abstract: The maximum force total elongation of hot rolled ribbed steel bars was measured by extensometer and manual methods. The difference between the two methods was obtained, and the causes of the difference were analyzed. Combined with the implementation of the relevant standards for the tensile test method of hot rolled ribbed bars and metal materials at room temperature, reasonable suggestions for accurately measuring the maximum total force elongation of hot rolled ribbed bars were put forward. The results show that when the tensile force was the largest and the deformation was the same, the maximum force total elongation measured by extensometer was only 0. 34% different from that measured by manual method, and the value was relatively close.