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A statistical correlation method is used to study the effect of instability of the calculation datum ( used in traditional method of indirect adjustment) on calculated gravity results,using data recorded by Longmen Mountain regional gravity network during 1996-2007.The result shows that when this effect is corrected,anomalous gravity changes before the 2008 Wenchuan Ms8.0 earthquake become obvious and characteristically distinctive.Thus the datum-stability problem must be considered when processing and analyzing data recorded by a regional gravity network.