The brand is very important because it is to give consumers what's the meaning in the highly competitive luxury industry. It may represent different status, but luxury goods are almost all expensive, how to keep consumers loyal and buying that is the most important thing, when luxury goods choose to use brand extension, it may have certain risks than other general brands, for example, luxury brands using brand extension, cooperating with different styles, positioning apparel brands or launching new series, it will affect brand associationm , brand awareness and even perceived quality in the minds of consumers, it indirectly reflects the consumption attitude in the evaluation of brand extension, which will also affect the purchase intention, and luxury brand is regarded as a symbolic brand image in the past, but in fact luxury brand can be divided into functional concepts and symbolic concepts. Therefore, this study discusses different types of luxury goods as interference variables for brand attitude, brand extension benefit evaluation, purchase intention, which type of brand extension's effect is better, and discussing use brand extension in the luxury apparel industry whether consumers have a significant relationship between brand attitude and brand extension benefit evaluation even purchase intention, it will help luxury brands to understand consumer behavior.