Cross-border shopping represents an important concept for online cross-border e-commerce in 2020. We took place in mainland China with the covid-19 in 2019, which led to a large number of consumers buying masks globally. Many consumers will go to other countries to buy medical products such as masks and alcohol through online cross-border means. Consumers' purchase cognition, impulse purchase and illness information all lead to consumers' purchase intention and satisfaction. The public medical event caused consumers to buy masks, alcohol and other medical products in large quantities to prevent the epidemic. The results of this study show that consumers' expected purchase of goods, mainly due to the shortage of masks, indirectly leads to consumers' expected purchase of goods on online foreign e-commerce platforms. We found that consumers' expectations and perceptions lead to impulsive online purchases and ultimately to an understanding of consumer satisfaction.