The formula to calculate the diameter of branch pipes and ellipse girth was given when the diameter of main pipe is known or reverse to resolve, discussed calculation accuracy.

On the basis of approximate effect, the calculation formula of temperature field with elliptic Gaussian beam radiation has been deduced and widely applied.

This paper gives two kinds of calculation methods of natural frequency of a mass-even elliptic column which oscillates in miniamplitude on a plane, obtains two formulas of natural frequency.