Abstract: Communication in rock mass is a branch of radio communication, specially dealing with the study of transmission and reception of communication signals in strata.The paper, based on description of advantages of the application of communication technology in rock mass in underground engineering and mines, further states the concept of communication in electrical current field.It is indicated that the safety of the application of communication in electrical current field in coal mines is not only related to the signal power, but also to signal frequency.And it proposed problems needed to further study in determination of basic principles of development of communication equipment in rock mass and in the field of communication in rock mass.