By making use of the similar methods described in reference[1] , a series of criterions on the oscillatory properties of neutra l hyperbolic equations were established.

• 研究一类变时滞的中立型双曲方程解的振动性质，利用与文献[1]相类似的方法和泛函微分方程的某些结果，建立了若干振动性的判别准则。