The numerical modeling of geological structural deformation is based on the related scientific laws and principles, which have been well recognized in the fields of mathematics, physics, chemistry and so forth. By making use of the advanced computer technology and numerical analysis algorithms, the geological model used in the numerical modeling is also based on the available scientific database coming from the solid Earth. Therefore, the essence of the numerical modeling of geology structural deformation is to adopt the wellestablished numerical methods of multidisciplinary acknowledge including mathematics, physics and mechanics to solve the relevant geological problems scientifically. Because it can synthetically combine the achievements in other disciplines, the numerical modeling has become a useful tool worldwide in the fields of geosciences. In addition, there are no time-space limitations for all sorts of geological models. The numerical modeling is an effective method to quantitatively solve most complicated geological problems. This will promote the revolution of the research methods from the traditional description methods that have been adopted for many years to the scientific and quantitative methods in the geosciences of China.