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An isolated and fast decayed active region (NOAA 9729) was observed whenpassing through solar disk. There is only one CME related with it that give usa good opportunity to investigate the whole process of the CME. Filament inthis active region rises up rapidly and then hesitates and disintegrates intoflare loops. The rising filament from EIT images separates into two parts justbefore eruption. A new filament reforms several hours later after CME and theaxis of this new one rotates clockwise about 22 degrees comparing with that ofthe former one. We also observed a bright transient J-shaped X-ray sigmoidimmediately appears after filament eruption. It quickly develops into a softX-ray cusp and rises up firstly then drops down. Two magnetic cancelationregions have been observed clearly just before filament eruption. Moreover, themagnetic flux rope erupted as the magnetic helicity approach the maximum andthe normalized helicity is -0.036 when the magnetic flux rope erupted, which isclose to the prediction value based on the theoretical non-linear force-freemodel.

Eruption of the magnetic flux rope in a fast decayed active region