Operation control is the process that the qualified certificate holders use thesystem and procedures for flight control,to control the start,duration and termination of a flight,including the flight before the preparation,flight dispatch release,full flight monitoring,etc.To implementing operational control on airlines ensures that the company plans to complete the scheduled flight and ensure flight safety with high efficiency and low cost,and it can effectively fulfill the rules and regulations in the operations manual CAAC and airline.This book is based on CCAR-121,combined with multiple regulations related to civil aviation and the actual operating procedures of airline, referring to editor's theory and practice teaching experience of flight dispatch.