The characteristics,designing,construction and checking methods of the advanced and applied underpinning technology,steel fiber pile technology,are introduced.

Research of shear bonding strength of fiber posts bonding with resin cements;

Stress effect analysis of effect of posts and adhesives with different elastic modulus to the fiber post restorations;

Effects of different type of spectrum on the bonding strength of the fiber post;

Three-point bending test on domestic carbon fiber post;

Test of resistance strength on restoring by domestic carbon fiber posts;

The restorations of immature permanent teeth with crown fractures by carbon fiber posts and resin cores;

and adopting advanced cooling control process,tubular pile steel wires with good surface quality,high precision and excellent comprehensive mechanic property is produced.