With the development of communication technique

5 G network needs to be considered in the public radio network coveraged the metro.In order to use the advanced technology of 5 G network

the public radio network needs to use 4 leaky cables to coverage the metro tunnel.All three telecom operators have more than ten network systems

about the allocation of network systems in the 4 leaky cables

this paper analyzed the intermodulation interference in the more than ten network systems and gived some suggestion.