A fuzzy automatic control system directly realized by using of mul iple element logic （DYL） circuit is proposed. The principle of the system is to fuzzily quantify the input analogue quantities and to make a fuzzy decision according to human experience in controlling a certain object. The system will transfer the fuzzily quantified control quantities into the output analogue quantities

and then to control the desired objet. The distinguishing feature of the system are as follows: The unnecessity of using A/D and D/A transformations

the simplicity of the system structure

the convenience of regulation and the applicability to on-line and real time control and regulation.