College of Geo-exploration Science and Technology��Jilin University��Changchun 130026��China

Airborne gravity exploration acquires regional gravity data faster than ground survey does�� In order to detect the target's anomaly and acquire airborne gravity data effectively and safely��we purposed a new assessment of target detection rate��and it can be used to instruct the optimal survey parameter design�� We apply the criterion of reliable anomaly to define the critical standard of target detection��and define target detection probability�� We an- alyze the influence to target detection rate of target parameters��including depth��horizontal size and others�� We plot the 3D map of target detective probability with respect to flight height��survey lines spacing and station spacing��