The researching methods of BVP of difference equations can trace back to those of differential equations. So far many methods and skills have been accepted, such as: critical point theory ,fixed point theory, topological degree theory.

• 差分方程边值问题的研究来源于微分方程边值问题的研究方法，微分方程边值问题的研究已经有许多方法和技巧，例如：临界点理论、不动点理论、拓扑度理论等等。