According to the conditions of the low level of automation and low labour productivity，an automatic control system for flotation
process was designed and developed innovatively based on the ControlLogix series software and hardware platform of Ｒockwell Company．
The structure and function of the control system are introduced carefully． The control strategies of the pulp level，the air flowrate
and the flotation reagent feeding are described in detail． The control software and human － machine interface are designed and developed．
The actual industrial application results show that the control system operates steadily，safely and reliably，the worker labor intensities
are decreased obviously，and the work condition is improved，the competitiveness of the enterprise is enhanced．