The invention discloses a method, device and system for realizing networking in a wireless network. The method comprises the following steps: receiving the frequency point information of a frequency point to be tested, receiving test data according to the frequency point information, and processing the test data; performing spectrum analysis on the frequency point information currently adopted by the equipment to access network by use of the processed test data, and judging whether the frequency point to be tested is available or not; if the frequency point to be tested is available, notifying a network administrator; otherwise, allocating the frequency point information of the next frequency point to be tested; and if the judging result indicates that the frequency point to be tested is available, allocating the frequency point to be tested to the equipment to access network by the network administrator so that the equipment to access network uses the frequency point to access the network. Through the invention, the interference judgment is free from limitation of the interference type, and the frequency point free from interference can be conveniently and accurately allocated when a new network element is added, particularly under the conditions of complicated environment and lacking network regulations.