Keywords: Liquefaction of saturated sands has often been the main cause of catastrophic damage to structures resulting In 1088 Of life and property. If a loundatlon soli Is liable to IIquely during an earthquake •• ddltlonal strengthening of the superstructure Is not of any help In the event of an earthquake. Thl. has been amply demonstrated during Nllga’. Earthquake. 011ge4 and earlier In Nepal Bihar earthquakeot 1934. It Is therelore extremely Important that the possibility 01 IIquelaction 01 .and during an anticipated earthquake must be determined and a suitable treatment 01 foundation loll If necessary be carried out before construction. Since these mealures are often costly and time consuming It Is very necessary, to have a realistic approach of Ifquefactlon analysis. An Investigation hi. been carriEd out by the authors on horizontal vibration table to det.rmlne If a particular soli deposit would IIquely under an anticipated ground motion and a new method of analysis has been developed. This has been shown to be quite • r.allstlc and reliable approach. Two sltel has ,been analysed. At one alte the sand had liquefied while at the other site. the sand had not IIquelied du~ng the 1964 Nllgata earthquake. The predicted results tally extremely well with the observed behaviour. Such a prediction has been possible for the first time and the method may replace the Seed and Idrlss (1971) approach which I. at be.t approximate.