Abstract To find out survivors in some disasters such as earthquake or fire hazard is an extremely important work. The faster search- and-rescue team detect them, the more possibility they could survive. This paper has proposed a new positioning technology based on pseudo base station which designed for searching the survivors under the ruins in earthquake or fire hazard. It could search survivors indirectly by finding the cellphones supposed to be with them. The result of several test shows that the technology could search cellphones in large area in short time. That means this technology will be able to find the survivors under the ruins in disaster area with quickly. That's what is needed urgently for disaster relief work.