The embodiment of the invention provides a pilot distribution method and system of a multi-antenna system, and an electronic device. A cell group to be optimized can be confirmed according to a pilotrepetition rate of cells; the interference intensity of a user is confirmed in the cell group to be optimized according to the distance from the user to a base station and the transmission power; andpilots are subdivided for users successively according to the interference intensity, thereby achieving reasonable distribution of the pilots and reducing pilot pollution.