Method for controlling upper-middle temperature of catalytic cracking raising pipe

The invention provides a method for controlling the upper-middle temperature of a catalytic cracking raising pipe, comprising the following steps of: atomizing a medium which is easy to vaporize, such as an oil-water mixture, by using an incondensable dry gas, and injecting into a reactor by selecting a nozzle with an atomization function; and fast vaporizing on the downstream position of a spray nozzle positioned on the upper-middle appropriate position of the catalytic cracking raising pipe, wherein a temperature reducing amplitude can maximally reach 20 DEG C. The invention can also eliminate water attack vibration noises generated when vapors contact with the medium and reduce the yield of the incondensable dry gas about 0.3 percent and the coke yield about 0.2 percent.