對於對等式資料散佈架構來說，目前所提出的架構可分為三類，分別為鏈狀架構(linear chain)、樹狀架構(tree)與平行樹(parallel trees)架構。本論文提出了一個不同於前述三種架構的一個新的傳輸架構 － 「非對稱平行串流架構」(APS，Asymmetric Parallel Streaming)，這個架構的優點是可以利用多餘的上傳頻寬來減少檔案的傳輸時間，而且不會有節點在所有的平行樹中都是葉節點，更符合了對等式系統中節點地位平等與頻寬共享的目標。在文章之後的章節中將會研究分析非對稱平行串流架構和其他架構的不同之處，並比較各種架構的優缺點，並且利用NS2進行模擬來加以驗證。

　For the peer-to-peer content distribution, there are three architectures have proposed, linear chain, tree and parallel trees. There is a new architecture proposed in this paper called APS (Asymmetric Parallel Streaming). The APS can use the unused download bandwidth on the nodes to reduce the distribution time and meet the goal of fairness between nodes in peer-to-peer system because there is no node which is the leaf node in every parallel tree. The theorem of APS, the simulation study and the compare with other architectures are all discussed in this paper.

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