Abstract: As a new type pile, Research on Halfscrewed Filing Pile is far from enough. The vertical load transmission mechanism thoroughly is analyzed about Halfscrewed Filing Pile in mudstone foundation based on the static load experiment results, except ,ultimate bearing capacity formula is deduced and the reliability basis of the halfscrewed pile design is provided.

Key words: Halfscrewed Filing Pile, mudstone foundation, bearing capability, expressions of the ultimate bearing capability