The source combination model of the Yushu MS7.1 earthquake in Qinghai province on April 14,2010 is discussed.Using the view point of slowing down in critics the foreshocks before the Yushu earthquake are identified in some sense.The occurrence date prediction of the Yushu earthquake is suggested to be determined by the methods of ＂rhythm of multiplied nine days in different years＂ and the ＂two times of magnetic storm＂.