Refers to a tourism destination or tourism enterprise that only provides a single type of tourism products and lacks diversity and selectivity. A tourist destination only provides cultural relics sightseeing or natural landscape sightseeing, but lacks other types of tourism products, or a tourism enterprise only provides one type of tourism routes or services, but lacks other types of choices. This situation will lead to the decrease of consumers' selectivity and insufficient ability to meet different consumers' needs and interests, thus affecting the development and competitiveness of tourism.