基本控制點為各項工程之基礎，成果良窳將直接影響國家基本發展建設。台灣大地基準TWD97(Taiwan Geodetic Datum 1997)建置至今歷經上級參考框架改變、突發性地震及不均勻性的地殼變動之影響，其建立時的系統精度是否依然保持良好值得探討。本文蒐集2002-2004年3年的國內外追蹤站、精密星曆等觀測資料，及IGS組織提供的每週全球追蹤站坐標和滿秩的變方-協變方矩陣SINEX成果，藉以建立嚴密架構於上級參考框架ITRF2000下之台灣追蹤站坐標與速度場，並利用不受地震影響及不均勻性地殼變動之追蹤站計算TWD97&ITRF2000兩框架於相同時刻之轉換參數。
　　分析成果顯示，1999年921地震之後，ITRF2000框架下各追蹤站之速度量僅有陽明山(YMSM)、金門(KMNM)與馬祖(MZUM)三個追蹤站與TWD97系統建置時之速度場差異較為一致，故透過此三追蹤站計算由TWD97(參考ITRF94框架) 轉至ITRF2000之框架轉換參數。平面N、E方向轉換參數分別為-1.66±0.66 cm與7.56±0.64 cm，高程U方向為-6.12±0.85 cm；平面N、E方向速度平移轉換參數分別為-0.44±0.04 cm/yr與-0.50±0.04 cm/yr，高程U方向變化速率則為2.36±0.05 cm/yr。

　　The geodetic control stations are the foundation of engineering, and the qualities of stations have a great effect upon capital constructions of the country. Since Taiwan Datum 1997(TWD97) was constructed at the 1997 year, TWD97 has been influenced by the transformation of International Terrestrial Reference Frame (ITRF), sudden earthquakes, and instable crustal motions. Therefore it is worth discussing the maintenance of the precisions of TWD97 up to now. This research collects the GPS observations of Taiwan tracking stations and of IGS tracking stations between 2002 and 2004 years, precise ephemeris, and the IGS weekly SINEX results included coordinates and full variance-covariance matrix of IGS global tracking stations. By combining with these data, we acquire the coordinates and velocities of Taiwan tracking stations under ITRF2000, and we compute the transformation parameters between ITRF94(referred by the TWD97) and ITRF2000 by using tracking stations which were not influenced by earthquakes and instable crustal motions.
　　The analysis results show that the difference of velocities of Taiwan tracking stations under ITRF2000 and under TWD97 is only identical with YMSM, KMNM, and MZUM. Therefore, the three stable tracking stations are used to be common stations in order to compute the transformation of seven parameters between ITRF2000 and TWD97. The plane shift parameter of North and Earth is about -1.66±0.66 cm and 7.56±0.64 cm, and the vertical shift parameter is about -6.12±0.85 cm. As well as the variation of velocity of North is -0.44±0.04 cm/yr, of Earth is -0.50±0.04 cm/yr, and of vertical is about 2.36±0.05 cm/yr.

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