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The intermediate phase of hydrothermal synthesis of the Na0.44MnO2 (NMO) nanowires is systematically investigated by means of transmission electron microscopy (TEM).The coexistence of Na-biessite and NMO is commonly observed in the nanosheets.The NMO nanobelts in general have the width of ～15nm embedded in the (001) oriented Na-biessite nanosheet.It is also found that the nanosheets of this intermediate phase often split along the NMO and Na-biessite interface.Our structural study also shows that the NMO nanobelts prefer to grow along the [001] direction and gives rise to the [001] elongated NMO nanowires.Based on our TEM observations,the visible lattice mismatch and the resultant strain at the NMO/Na-biessite interface play a critical role for formation of notable splitting structures in this kind of nanomaterial.The mechanism for the formation of the [001] NMO nanobelt is briefly discussed.