The　entorhinal　cortex　(EC)　plays　a　pivotal　role　for　spatial　representation　and　navigation　in　rat.　Understanding　how　information　is　processed　in　the　entorhinal　cortex　is　essential　to　help　us　know　the　self-motion-based　navigation.　This　article　introduces　the　connection　of　entorhinal　cortex　and　hippocampus,　main　cells　in　entorhinal　cortex　and　their　interactions,　then　put　forward　one　model　of　the　entorhinal　cortex.　The　structure　of　this　model　is　consistent　with　head　direction　cells　and　grid　cells　in　entorhinal　cortex,　simulating　grid　cells　firing　fields　very　well.