简述了两类接触问题的区别及将接触问题置于机械系统中进行研究的必要性；阐述了三种求解接触问题的力学模型，并简单分析了各自的特点。最后指出最小势（余）能原理为求解接触问题的各种数值方法的实质基础，根据此基础，可解决更为复杂的系统接触问题 The differences between the two types of contact problems and the necessity of putting the contact problems in the mechanical system are briefly described. Three mechanical models for solving the contact problem are described and their characteristics are simply analyzed. Finally, it is pointed out that the principle of the minimum potential (residual) energy is the substantive basis of various numerical methods for solving the contact problem. Based on this principle, more complicated system contact problems can be solved