Grid　cells　in　the　medial　entorhinal　cortex　of　rats　have　special　firing　characteristics.　The　cells　fire　repeatedly　and　regularly　corresponding　to　a　specific　spatial　location.　This　is　a　relatively　small　space,　which　is　called　grid　cells＇　firing　fields.　Multiple　firing　fields　overlap　each　other,　which　finally　forms　the　grid　nodes.　When　the　rat　reaches　any　grid　nodes　in　the　environment,　there　exists　the　corresponding　grid　cells　which　discharge　maximally.　Furthermore,　an　equilateral　triangle　is　formed　by　connecting　grid　nodes　and　the　triangles　are　covered　with　the　entire　environment.　Since　Hafting　et　al　discovered　grid　cells　in　entorhinal　cortex　of　the　rat　in　2005,　researchers　have　paid　more　attention　to　the　regular　firing　structure　of　grid　cells.　With　the　further　studying　on　grid　cells,　it　proved　to　be　that　entorhinal　cortex　plays　an　important　role　in　path　integration.　Most　importantly,　grid　cells　act　as　the　function　of　path　integrator　in　the　process　of　path　integration.　Based　on　what　we　have　mentioned　above,　we　put　forward　a　computational　model　for　the　formation　of　grid　field　based　on　path　integration.　Our　proposed　model　simulates　grid　cells＇　firing　fields　very　well　in　that　the　simulation　results　of　our　proposed　model　are　in　agreement　with　grid　cells＇　biological　experimental　electroencephalogram　results.