In　this　paper,　the　open　recoil　loop　is　simulated　by　establishing　the　simulation　model　of　hard-phase　grains　(Sm2Co7)　dispersed　in　soft-phase　(alpha-Fe)　matrix.　The　influence　of　inter-phase　exchange　coupling　effect　on　the　openness　is　simulated　by　adjusting　the　soft/hard　phase　interface　integral　exchange　constant　(A(int)).　The　results　show　that　the　openness　does　not　depend　on　the　inter-phase　exchange　coupling　effect,　since　the　open　recoil　loops　can　be　acquired　even　the　A(int)　decrease　from　20　to　0　pJ/m.　The　interaction　energy　density　analysis　also　does　not　provide　strong　evidence　to　support　the　correlation　between　openness　and　exchange　coupling　effect.　The　magnetization　configuration　evolution　shows　the　irreversible　reversal　of　the　hard-phase　grains　is　root　cause　of　the　openness,　and　the　adjacent　soft　phase　enlarge　the　openness　degree　for　the　recoil　loop　of　the　nanocompiste　magnet.　Our　results　are　helpful　to　deepen　the　understanding　of　the　openness　in　recoil　loops　for　nanostructural　permanent　magnet　materials.