The design philosophy，calculational methods of bearing capacity and settlement of multi-element composite pile foundation with long and short piles are discussed. Meanwhile

taking foundation treatment engineering of compounding with lime-sand pile and CFG pile for example

the design

construction technique and treating effect on it are described. Engineering practice shows that

the composite pile foundation with long and short piles has multifarious compounding form

which do not restrict types of piles

which can actualize single-element or multi-element compounding

and so it can make full use of the potentials of soil and long and short piles. Long and short piles foundation demands fewer long piles

but it can effectively improve foundation bearing capacity; and it can control the average settlement and differential settlement; effectively

therefore

it will be very immensity foreground of engineering practice.