本論文以三維勢流理論解析三體船在規則波中以等速航行受流體動力而造成的船體運動，並利用源點分佈法之技巧來分析非穩態流體動力問題。

　　在不考慮穩態興波效應影響時，以三維脈動型源點配合小板法來解析船體運動理論之繞射和輻射問題，首先利用小板法將船體浸水表面劃分成許多四角形小板，在四角形小板上分佈三維脈動型源點求解源流強度及壓力分佈，進而求得非穩態之三體船運動問題。
本文所計算之結果與實驗值互相作比較，來驗證本文所用數值方法之準確性。由結果可知除了在高速下FN=0.45時縱搖項目與實驗值在共振區之發生有所誤差之外，本文所發展之數值方法在預估三體船運動有相當不錯的結果，在進一步分析在福勞數為0.15時，在波浪入射角分別為為 , , , , 情況下，其縱向結構位置及橫向間距對三體船運動之影響。

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