A wheelchair is a living aid for people with lower limb functional disorders. In terms of structure and function, wheelchairs can be divided into four categories: the first is soft seat cushions; the second is hard seat cushions; the third is high-back wheelchairs; the fourth includes wheelchairs with some special functions, such as those with movable small dining tables, with commodes, or ones that can be laid flat to serve as a simple bed, etc. When designing a wheelchair, its usage can have multiple functions, but these functions cannot all be embodied in the same wheelchair at the same time. Users need to purchase according to their own needs. For example, paraplegic patients spend a long time on the wheelchair each day. For these people, the wheelchair is not only a mobility aid but also a living space during the day where they need to eat, drink, study, and handle personal hygiene. When purchasing, one should choose a wheelchair with a movable dining table, a reclining high-back wheelchair, and a wheelchair with a movable commode would be even more suitable. Here we introduce four websites about wheelchairs that best understand online marketing.