中文摘要：

总结了滴头流道内水流流动机理研究的进展情况，分析了研究滴头流道内水流流动机理的3种方法（理论分析方法实验研究方法及数值模拟方法）的具体内容和存在的问题。针对这些问题，对滴头流道内流动机理的研究方向提出了建议。

英文摘要：

The advance of research on the inner flow mechanism in the flow passage of emitter is summarized in this paper. The detailed content and existing questions of three research methods, namely theory analysis, experiment research and numerical simulation, are analyzed too. Aimed at these questions, some suggestions for the research on inner flow mechanism in the flow passage of emitter are brought forward in the end.