Based on navy requirements and essential characters,the basic resource layer,information transfer layer,collaboration computing layer and service aggregation layer which make up of navy information grid are analyzed.

These days, information grid is a research hotspot, and provides the share of resources and information for science computing, and so on.

The Global Information Grid Bandwidth Expansion intending to upgrade the transmission capacity of some of the busiest parts of DoD s existing communications networks is a important part of GIG.

This paper describes the concept and definition of GIG (Global Information Grid), discusses the reasons for its origin and development in detail, and shows the current status of technology to realize GIG.

This paper analyses the use of modeling and simulation in GIG, besides, provide some relation technique framework.

The global information grid(GIG) includes all owned and leased communications and computing systems,software,data,security services and other associated services which are necessary to achieve information superiority,the GIG is the cerebrum of network center warfare.

In 1999,DOD put forward a tentative plan of building global information grid(GIG).

To adapt to the demand of network centric warfare(NCW) and realize the global attack tactic,the USA army started the plan of global information grid(GIG) in 2000.

Based on Spatial Information Grid (SIG) of the intelligence-gathering system;

A Study on the Market-mechanism Based Scheduling Model for the Spatial Information Grid;

By taking grid technology and web services a s its technical core, spatial information grid (SIG) shares and aggregates the d istr ibuted enormous spatial information resources to implement dynamic integration a nd collaboration.

The paper presents the architecture of Spatial Information Grid(SIG).