The utility model provides a structure is sealed to two seat of compression, including the packer, the packer tail end is provided with anchor anchoring mechanism, packer upper portion still is provided with the packing element, and the packing element upper end is provided with the supplementary setting mechanism of hydraulic pressure, and this utility model at first provides packer setting power by one -way slips, if the tubular column takes place the condition such as drunkenness when leading to packer setting power not enough, at this moment provides the setting force by the supplementary setting mechanism of the hydraulic pressure of packing element one end, makes the packer remain the state of sealing of sitting throughout, the utility model discloses not only can satisfy reservoir reformation's needs, the reliable seat of packer seals in moreover can dual assurance multilayer section work progress.