The present disclosure provides a host computer, and a control system and method of a machine. The host computer includes a control unit, a service configuration unit, and a functional flow unit. The control unit is configured to control a lower level computer to execute items of a functional flow of the machine. The service configuration unit is configured with action instruction information used to execute the functional flow of the machine and configured to interact with the control unit. The functional flow unit stores items of the functional flow of the machine edited by a user and is configured to interact with the control unit. A technical solution of the host computer and the control system and method of the machine may realize an editable function of the functional flow of the machine to improve flexibility, convenience, and a degree of automation of addition/modification of the functional flow.