Abstract: The research of the technology of thin intercalation in thick layer was developed aiming at the production status and the existent problem. The constitute, technology principle, main technique parameter and characteristic of the technology and the effect of field test were introduced. The structure characteristic and work principle about Y441-114 packer, Y341-114 packer, locator and others match tools were narrated. The unpacker load of Y341-114 and the struck freeing load of Y441-114 packer were calculated. Field test indicated, being free point located accuracy, plugging tight and fetching out easily, the technique can content water shutoff in thick layer with thin intercalation.