The present invention discloses a method for realizing the code division multiple access system reversal loading and a device. The method comprises that a signal source is communicated with a radio frequency input port of a detected sector, when the code division multiple access system is under idle condition, the code division multiple access code division multiple access enquires the receiving signal intensity indicated value of the system, and inputs the reversal code division multiple access signal produced from the signal source to the radio frequency input port of the detected sector ofa base station, and makes the difference of the present receiving signal intensity indicated value of the system and the receiving signal intensity indicated value under idle condition be -10log(1-L)through adjusting the output signal power of the signal source; the device comprises the signal source, an inquiry unit and a power adjusting unit. The present invention can accurately realize the CDMA system reversal loading, improves the testing efficiency of the system, and reduces the resources occupancy.