Pyrotechnic automatic controlling system consisting of pyrotechnic automatic elements is one of the latest development of pyroautomatics,and this kind of system is quite promising in the fields of astronautics,fire fighting,automation of chemical processes,safety in production and so on . Pyrotechnic automatic elements widely used in pyrotechnic automatic systems include initiating,transmitting,time-programming,signal-transforming,logical,and executive elements. The pyrotechnic agents used for different kinds of pyrotechnic automatic elements should have different properties. Several compositions and elements for automatic controlling and an example for protection control of chemical processes have been given.