Int his paper, a finite element method of triongular division is presented for a two dimensional-and two phase (oil and water) nonlinear model in reservoir.Authors designed associated computer program, gave the saturation distribution during oil production with the data in Daqing oil field in connetion with IBM-PC/XT computer, and predicted the break through time with satisfactory results.On the basis of theoretical analysis and the results the finite element method was compared with the finite elent method of rectangular division and the finite difference method.

In this paper we give a method to raise the resolution of some narrow frequency domain-band, it is called ZOOM-FFT1,and we implement it on the computer. We affirm the superiority of this method on solving to raise the resolution of frequency. At the same time, we also implement the method ZOOM-FFT2 on the computer to raise the resolution of the whole frequency domain-band, we point out it's applicable region. According to these two methods, we program two subroutines, which can use small capacity FFT analyzer to dispose of large capacity input data, and can give different spectral lines of resolution power spectral function and correlation function.