本文主要是以理論解析的方式，探討波浪進入雙開口的港池時，港池內部水道的波動情形。先介紹前人推導出來的單一港池與鄰近雙港池之理論解析，再進一步導出雙港池間有連通水道時的情形。
港池振盪為特定波長之波浪入射狹長港池之後，因能量累積在港內無法消散，而產生的情形。而知道何種波長的波浪進入港池會產生振盪，與港池的哪個部份會產生振盪，可以預防港口內的設施和船隻遭到破壞。
當雙港口並排，一個港池共振時會使得另一港池的水位也跟著升高。而雙港口間又有水道連通時，若入射波波長為連通水道長度的n/2（n=1、3、5…）倍時，會在連通水道內形成駐波。如果兩個港池長度相等，因為整個結構呈對稱，所以兩個港池內的水位也是對稱狀態。
本文結果探討港池尾端的波高放大因子R與入射波波數k的關係，與雙港池間連通水道裡的波高狀態。希望能藉此結果給予港池工程設計時作為參考。

The subject of this paper focuses on the theoretical analysis of two-entrances harbor resonance. Development and conceptual evolution on harbor resonance are reviewed, and analytical solutions for two-entrances harbor with constant depth are constructed and analyzed.
The resonance coupling between two adjacent inlets is investigated. When a canal link two inlets, the incident wavelength is n/2（n=1、3、5…）times the length of the linked canal, the linked canal will have the standing wave. If two inlets are the same of length, the structure is symmetrical so that the water level of two inlets are the same of water level.
The purpose of this thesis is on the analysis the relation between amplification factor R and wave number k. The result can apply to harbor engineering practice.

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