For the preparation of metal-organic frameworks MOF-5, three different ways, hydrothermal synthesis method, direct method and direct method with adding extra H_2O_2 were used to prepare compound MOF-5 crystals. The MOF-5 crystals were characterized by X-ray diffractometer(XRD), scanning electron microscope(SEM), Fourier transform infrared spectrometer(FTIR) and thermo gravimetric analyzer(TG). The effects of different synthesis methods on the crystals structure, morphology and thermal stability of the compo...