This paper uses several methods of complex functions theorey to prove fundamental theorem of algebra by argument principle,maximum modulus principle and minimum modulus principle.

This paper sets up and proves the argument principle and the pouche theorem of bianalytic function in the range of extended complex plane.

The stress mechanism of bored occluding pile and its application in soft soil stratum;

Based on the stress mechanism with composite foundation and rigid foundation,and the accuracy grade of pile positioning,the author believes that the existing technical standards for pile displacement in soil-cement mixed pile foundation are unreasonably rigorous.

Therefore,it is necessary to calculate coupling of digged foundation and soil around it to analyze stress mechanism of undisturbed soil foundation and distribut.

Started with force mechanism of common effect between reinforcing steel bar and concrete and combined with practical construction,the author deeply discusses the importance of reinforced protective layer and its control in the construction,and lists its minimal thickness,in order to make engineering construction technology more advanced and guarantee the quality of engineering.

So we should attach importance force mechanism and enhance constitution design of structure member,and apply mechanics principle to analysis and settle practical problems.