經由恆星徑向速度的量測來偵測系外行星，是近年相當熱門的方法，目前發現的系外行星，有超過95%是由此種方法發現的。根據中心恆星徑向速度周期性的變化，我們可以推測系外行星可能的質量、離心率以及半長軸。本篇論文透過程式SWIFT的模擬，並利用卡方檢定，試圖預測16 Cygni B (HD 186427)系外行星系統是否有尚未被發現的系外行星的可能，並進一步討論該系統內已知行星與假設的額外行星，在長時間模擬下系統的穩定性與彼此的交互作用。

The radial velocity measurement is a popular method to detect exoplanets in recent year. About 95% of discovered exoplanets were found by this method. According to the periodic velocity variation of the host star, we can predict the possible mass, eccentricity, and semi-major
axis of the exoplanets. Through the code SWIFT, the
observational data of 16 Cygni B (HD 186427) planetary system is used to predict the possible undiscovered additional planets with the chi-square method. Finally, we check the stability of the system when both detected and additional planets exist and interact each other.

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