Conventional layered fracturing and acidizing technology sets all packers in the string before the first layer construction. During the construction, only the balance pressure can be applied to the string above the top packer, and the balance pressure cannot be applied to the string below the top packer. If abnormal high pressure occurs in construction, it may cause overpressure of lower packer and affect the safety of pipe string. Therefore, conventional layered fracturing and acidizing technology is difficult to meet the needs of high temperature and high-pressure oil and gas reservoir stratification. In view of this technical problem, new tools such as Y344 controllable setting packer, layered control slide sleeve and reverse circulation repeated switch slide sleeve have been successfully developed, forming a new layered fracturing and acidizing technology. The technology can realize the time-sharing start-up of each packer, the balanced pressure can be applied to each set of packers, the construction string is safer and more reliable, and the sealing condition of each layer of packer can be judged intuitively. The field application shows that the packer is reliable in temperature resistance, pressure bearing and smooth in unsealing, and the controllable setting packer can be started independently, which can meet the needs of multi-layer layered reconstruction technology of high temperature and high-pressure reservoir.