Abstract: Set packer may be jammed by impurities in oil wells, as a result, the packer could not be set. In view of this, sand control packer is designed. Through the design of sand control bridge channel, pins are used to fix sand control ball seat, so as to ensure the connection of casing. Inverse well flushing structure is designed. Impurities could be eliminated through inverse well flushing as soon as grits and other impurities deposit on the sand control ball set, so that the packer could be set as normal. This could guarantee the construction technology to be completed reliably. From the application in 15 wells, the phenomenon of sand blockage does not occur in any well, the success ratio of the technology reaches 100%, providing technological support for chemical plugging.