Cactus put next to the computer can not prevent radiation, because the cactus can not absorb electromagnetic radiation produced by computer products. Cactus belongs to drought-tolerant plants, can absorb red light, ultraviolet light, infrared, ultraviolet, etc., computer radiation is electromagnetic radiation, belong to the invisible radiation, so cactus placed next to the computer can not play a role in radiation protection. Cactus can play a role in purifying the air, increase the role of fresh indoor air, cactus also has a high medical value, daily can be reasonable choice. In addition, according to research shows that the radiation of the computer radiation is very small. But daily do not use the computer for a long time, will make the eye discomfort, use a period of time, pay attention to rest and eye protection, eat more fresh vegetables and fruits, timely supplementation of vitamins, can effectively prevent the harm caused by computer radiation.