The stainless steel rolling annealing and pickling line is the most complex production line in the field of stainless steel cold rolling,which has become the development trend of equipment technology in the field of stainless steel cold rolling.The technological process,main technological parameters and calculation of stainless steel rolling annealing and pickling line were introduced,and the selection and calculation of main parameters of looper was introduced,for example the looper quantity and the length of the rollers,and introduces the quantity、layout and calculation of strip centering device.Using the test results in the site to prove that the direction of the combined the zigzag centering roller and the double centering roller strip centering theory is correct.It provides reference for the design of stable strip running of rolling annealing and pickling line.