We vividly describe the equivalence principle in Einstein’s"general theory of relativity", and introduce the concept of gravitational field.Through the cases of buoyancy phenomenon and force balance in non-inertial system,we describe applications of the equivalence principle of the Einstein’s"general theory of relativity"in these practical problems.In the non-inertial system,using the Einstein equivalence principle can help solve some problems more easily,which look more complicated in inertial system.%形象地描述爱因斯坦«广义相对论»中的等效原理,引入引力场的概念。通过非惯性系中的浮力现象和非惯性参照系中的力的平衡的案例,来描述爱因斯坦«广义相对论»中的等效原理在这些实际问题中的应用。在非惯性系中,应用了爱因斯坦的等效原理,使一些在惯性参照系看起来很复杂的问题变得很容易解决。
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