The change rate of relative distance is a character signal of orbit maneuver of space target. Relative distance was measured by laser radar, and the change rate of relative distance was calculated by difference of relative distance. The measure noise was enlarged so the character signal was submerged in the noise. The wavelet analysis in differential scale was used to keep track of time and frequency information of the character signal. With the scale zoom out, the true signal was increased and noise was decreased. The existence of orbit maneuver can be judged by wavelet analysis in differential scale. In order to meet the requirements of autonomic computing on the satellite, the detection method applied correlation coefficient threshold to identification of orbit maneuver. The feasibility and effectiveness were verified by computer numerical simulation.