Abstract: On the basis of the in-situ test dste of more than forty piles artifically drilled by Loyang spoon and cast-in-place in West Henan collapsible loess befere and after immersion, the paper analyzed the vertical bearing behavior and law of variation in skin friction and other influencing factors.According to indices of the loess, a method for determining venical Bearing capacity of the pile in saturatedloees is presented.A table of calculating parameter is compiled. The computed values ofbearing capacity of pile groups agree with results of loading tests.