The invention relates to a combined networking using method based on weapon sighting systems. The combined networking using method comprises the first to Nth weapon sighting systems and a weapon fighting center; and the method includes the specific steps that S01, the weapon fighting center is in communication with the first to Nth weapon sighting systems, and the first to Nth weapon sighting systems are numbered; S02, the first to Nth weapon sighting systems transmit obtained image information and sensing information to the weapon fighting center; and S03, the weapon fighting center achieves sharing cooperation of information of all weapon sighting systems and control over the first to Nth weapon sighting systems according to the image information and sensing information transmitted by the first to Nth weapon sighting systems. By means of the combined networking using method, the shortcoming that according to a traditional weapon sighting system, the human eye needs to be close to a sighting device is overcome, separation of the human eye and the sighting device is achieved, and the huge promotional value is achieved; and as a networking mode is adopted, comprehensive control over all weapon sighting systems is achieved, and the major strategic importance is achieved.