Armada area defense is a complex work. The long-range programming, tha having System of Systems(SoS) characteristics at strategic level, is very important and difficult for it. It's necessary to use Exploratory Analysis(EA) to help us have a broad understanding about the issue, by quantificationally exploring at a high-level model that specially built for EA, before going deep into details. The Armada area defence issue was analyzed at macro-level view, a software tool-EASim to support EA based on time-sliced influence diagrams was developed, a high-level analysis model was built, and some simple analysis illustrations were given.