1． College of Geo- Exploration Science and Technology， Jilin University， Changchun 130026， China; 2． Baixian Company，Northeast Electric Power Design Institute Co．，Ltd． of China Power Engineering Consulting Group， Changchun 130021，China

Spiking deconvolution is a standard Wiener Levinson algorithm． The autocorrelation of the design time gate is computed and there is a specified taper on the design gate before the autocorrelation is done． The standard equations are set up，prewhitening is added to the zero lag value of the autocorrelation and the matrix is inverted to derive the spiking operator． In this study，the authors describe a technique for performing spiking deconvolution on prestack time migration (PSTM) data，to test the effect of operator length and percent pre- whitening in spiking deconvolution and apply spiking deconvolution trace by trace，with operator lengths 15ms， 10 ms and 5 ms when percent prewhitening 0%，40ms and 60ms for percent prewhitening 1%． The results show when prewhitening is 0% the shorter operator gives better results， but when value of prewhitening is bigger than 0% it is better to use longer operator lengths．