Native mung bean starch exhibited the ‘A’ type crystalline pattern and showed a weak diffraction peak at 5.7_ 2q and two board peaks at 16.9_ and 19.7_ 2q. Compared with native starch, the heat-moisture treated starch had more intense diffraction peaks at 16.9_ and 22.9_ 2q. Moreover, the HMT starch showed new diffraction peaks occur at 15.0_ 2q, plus an unresolved doublet between 16.9_ and 17.5_ 2q.