This invention discloses a method and a system for carrying out in-line measurement in the TD-SCDMA system, in which, said method includes: A, obtaining the related power value of down pilot time slotsignals after the preliminary location, B, obtaining the corresponding channel profile window based on said related power, selecting a set of power values from big to small in the profile window andregistering the position, C, testing the effective paths and noise power in the channel profile window based on said related power value and the selected set of power values, D, computing values of the in-line measured items based on the effective path and noise power in the window.