ABSTRACT – Dynamic nature of particles behavior in extrusion, rolling and forging of aluminum and its alloys almost totally rules out the possibility for contact thermometry under continuous control of thermodynamic temperature. The authors examined the basic potentialities of non-contact passive optical pyrometry for these processes. Method of optical pyrometry which provides for thermodynamic temperature measurement at unknown and varying emissivity in the range of 200-1000ºC with maximal tolerance of approximately 1% are presented in the report. Results of industrial use of designed pyrometry systems obtained over a period of years for aluminum and its alloys in extrusion in a number of large companies in the USA, Europe, Canada, Australia etc. are discussed