Abstract: There are no low shear separate-zone profile correction strings available and separate - zone profile correction with polymer cannot be realized in the oilfield. In view of these problems, we develop several matching tools, including separate - zone profile correction packer, communicating vale and separate - zone profile correction controller, and low shear separate - zone profile correction string. This string can realize low shear separate - zone injection in any layer within 3 layers. It is characterized by rational structure, good separate - zone sealing effect, layered seal checking and high success ratio. Field experiment shows that the success ratio of separate - zone profile correction is 100%, and the shear rate of polymer profile correction fluid is below 3%. It successfully makes the separate - zone polymer profile correction string matched and realizes layered seal checking.