A method of measuring the talking time length of a mobile terminal in CDMA system, which is characterized in that: establishing testing environment of the terminal, measuring the average current I_Normal of the terminal when talking, measuring the capacity C of the battery of the terminal when talking; Based on the parameters concluded from step2, calculating the talking time length T_Normal, wherein, T_Normal=C/I_Normal. In the prsent invention, a communication network environment based on CDMA technology is simulated in a predetermined testing environment. In said environment, the talking timelength can be obtained by the tested average current when talking and the capacity of the battery of the terminal when talking. The environment needs not to be the best, and the testing is convenient and accurate.