For many years we have been studying Dr. Milton H. Erickson’s communication as a system trying to find out why it is so powerful and why its influence is so precise. In result we have found some regularities that we call secondary languages. The way of how Dr. Erickson used non-verbal patterns is very similar to the way of how natural languages work: each of the non-verbal signals in Dr. Erickson’s communication is used with some specific meaning which is understood by unconscious mind of patients in therapy or students in teaching. Using the methods of structuralizm we have analysed the meanings of some signals and the way of how Dr. Erickson associated those signals and the meanings. In order to test the results A. Tkachev used the model of secondary language in therapy. Working with patients he associated two of non-verbal signals with different meanings and used those signals to build therapeutic process. The experiment has shown that even the system of two signals being arranged as secondary language allowed to get stable positive shifts in the patients’ behaviour. And also the experiment has shown that the secondary languages can be used in therapeutic communication. The system of more than 3 signals as a secondary language is a powerful tool for therapeutic influence. Dr. Erickson used several secondary languages that contains several dozens of signals with different meanings. The structure of secondary languages is the structure of indirect suggestions.