通过构造Lyapunov函数的方法，讨论了两类四阶非线性非自治微分方程平凡解不稳定性，给出了其平凡解不稳定的充分条件，从而推广了相应文献的已有结果。%By the methods of constructing Lyapuno v functions,we discussed the instability of two kinds of four order nonlinear nonautonomous differential equations,and gave the sufficient conditions for the trivial solution that is not stable. Futhermore,the study extended the corresponding results in recent literatures.
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