Because of there are many ambiguous and fuzzy factors during the selection of the taking-boat zone of landing soldiers,a kind of optimization selection model which bases on catastrophe theory is introduced.

The ISC, SCSN and CRN seismic catalogue data are first transformed to the local time system and the sequence statistics are made, the time-occurring number of earthquakes are set up on the system of local time, and then the frequency spectrum analysis on the earthquake sequence is done to pick up information related to the characteristic period.