This paper indicates that Li-Horne model has its limitations,that is,the model of Li-Horne is derived from piston core type self-priming,which is only applicable to homogeneous core piston type self-priming process,and not covers non piston type self suction. The innovation of this paper lies in the derivation of a new model in the process of non piston self priming by BL equation(Beck Lelie Welter equation).%本文经过大量研究分析的基础上发现，Li-Horne模型存在其局限性，即Li-Horne模型只是在岩心活塞式自吸的前提下推导出来的，其只适用于均质岩心的活塞式自吸过程，对于非活塞式自吸，该模型并未涉及到。本文的创新之处在于通过BL方程（贝克莱列维尔特方程）推导出了在非活塞式自吸过程中的一种新模型。
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