在美中貿易戰中，美國為了制裁與中國的不平等貿易與竊取智慧財產權的懲罰，提高對中國的貿易關稅。兩國間的貿易戰所影響的範圍甚遠，不單單只是兩國國內經濟，也間接影響了各國之間的貿易模式。
臺灣在美國和中國處於中間的角色，兩國進出口貿易對於臺灣來說是相當的重要，且出口商品的品質對於一國的經濟和產業的發展有著強烈的關係。因此本文欲使用2015年至2020的UN comtrade 美國進口商品（HS 8541, 8542, 8523, 8529, 9002, 8471, 8473, 8517）資料來推估商品品質變化。為了檢驗從受影響國家到非受影響國家的替代效應，我們為美國幾個主要出口國建構了一個總單位價值指數和離散的Tornqvist價格指數。總單位價值指數的增長可以被分解為商品品質調整後的價格變化和商品組合調整的變化。
實證結果顯示幾乎所有的商品種類都有在美中貿易戰第一年提高商品的單位價值和總品質。而HS 8523固態硬碟、HS 9002 光學儀器和HS 8517 電話機這三種商品類別的商品組合之調整，在美中貿易戰中具有落後效果。這些商品類別雖未在關稅提高第一年提高其商品品質，但在關稅提高第二年時期，其上升幅度大於第一年品質降低幅度。臺灣的光學儀器和電話機商品類別在2015年至2020年有明顯的提升出口商品的單位價值和總品質，其餘商品類別的商品品質皆未有顯著上升。臺灣雖然在美中貿易戰時，各商品類別出口至美國的出口額有明顯的成長，但臺灣出口商品的品質並未有明顯的增長反而降低。

In the U.S.-China trade war, the U.S. has raised trade tariffs on China in order to sanction unequal trade with China and to punish the theft of intellectual property rights. The trade war between the two countries has a far-reaching impact, not only on their domestic economies, but also indirectly on trade patterns between countries.
The U.S. and China are important trade partners of Taiwan, and the quality of exports is strongly related to the development of a country's economy and an industry. Therefore, this paper aims to use the UN comtrade data of U.S. imports (HS 8541, 8542, 8523, 8529, 9002, 8471, 8473, 8517) from 2015 to 2020 to estimate the changes in commodity quality. To examine the substitution effect from affected to non-affected countries, we construct an aggregate unit value index and discrete Tornqvist price indices for several major U.S. exporting countries. The increase in the total unit value index can be decomposed into the change in commodity quality-adjusted prices and the change in commodity mix-adjusted price.
The empirical results show that almost all categories of goods have increased their unit value and total quality in the first year of the US-China trade war. The adjustment in the product mix of three commodity groups, HS 8523 solid state drives, HS 9002 optical instruments, and HS 8517 telephones, had a lagging effect in the U.S.-China trade war. Although the quality of these product categories did not increase in the first year of the tariff, the increase in the second year of the tariff was greater than the decrease in quality in the first year. Taiwan's optical instruments and telephones have significantly improved the unit value and total quality of its exports from 2015 to 2020, while the quality of its exports in the remaining categories has not increased significantly. Although Taiwan's exports to the U.S. increased significantly in all categories during the U.S.-China trade war, the quality of Taiwan's exports did not increase significantly but decreased.

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