Purpose: The purpose of this study is to analyze how ZARA and H&M's global supply chain management is carried out, how they reduce production time from 6-9 months to 3-5 weeks, and ensure product quality. Research design, data, and methodology: In order to achieve research purposes, this paper analyzes and summarizes relevant academic papers, degree thesis, and official website related reports. In order to ensure the accuracy of the data, all data related to sales and production are subject to the official website data. Results: The global supply chain management of ZARA and H&M has made them the king of speed in the apparel industry. The supply chain has shortened the speed of products from design to sales. It has won the favor of consumers. At the same time, the two will not produce the second time for products with good sales and out of stock, which increases the scarcity of the products. At the same time, the products in the store are updated every 2 to 3 weeks, which also increases the number of customers to the store. Conclusions: In order to analyze ZARA and H&M supply chain more accurately, this article analyzes ZARA and H&M supply chain from product design, raw material purchase, product design, product transportation, sales and promotion. The two shortened the entire supply chain to 3 to 5 weeks. The shortest time of the ZARA supply chain was 21 days. It can be said that it created the fast supply chain myth of the apparel industry, and of course gave up some economic benefits for this myth. Although the two have increased the speed of the supply chain, they have not given up the quality of the products, thereby further increasing the customer's purchase desire and satisfaction. This makes ZARA and H&M more competitive than other apparel companies. So that the company gains benefits. The pursuit of details has achieved the success of ZARA and H&M. They have designed different customers in different regions. H&M has put the cooperation with star designers to the extreme, not only increasing sales, but also improving the brand’s Image.