Key techniques in practical Tbps WDM optical transmission equipments are summarized in this talk, regarding optical transmission issues and the relative engineering solutions in the wide spectrum range and long distances, for example, the issues and solutions of Raman amplification and enhanced forward error correction. Moreover, new challenges in the manufacturing of this equipment include the controlling and managing aspects, to meet the practical requirements of Tbps WDM transmission. New devices and systems should be highly automatic, to ensure characteristics of automatic auxiliary maintenance or adjusting. Hence, intelligence solutions of spectral controlling, bit error rate optimizing, security ensuring, protection switching etc. are also referred in this talk. These are new characteristics of commercial Tbps WDM equipments in the future.