Ancients got inspirations from the soft water and expressed the thoughts that the soft and weak can overcome the hard and strong,which has strong philosophy.

The paper analyses the way of thinking that weak win firm and uncompromising by Lao-tzu,routs out the two ways that Lao-tzu had been used: one is the induction of empiricism,the other is the deduction of rationalism.

Master Lao s thought of"unity of being with nonbeing" belonging to philosophical thought about spiritual domain,have correlation with"softness and weakness"in life and society domain,i.

Hu was influenced deeply by Lao Tzu s thoughts that the soft and weak can overcome the hard and strong,and then was readily receptive to the non-resistence idea of Christinanity and humanitarianism.

Against the curved box girder bridges in highway bridges and urban viaducts,the curved grillage model of the multi-cells curved box girder is built in terms of the shear-flexible grillage method,and the analysis for the vehicle-bridge interaction is performed.