Introducing a set of operation monitoring and Controlling system for petroleumpump unit. The system consists of the principal computer-AST386 micro-computer and subordinatecomputer-STD Bus industrial control computer. It ean provide real time and graphical display of 55channel parameters,supply rarious information of man-machine talk by printing,power cutouutprotection,3 optimum control routes. With the help of serial communication,the principal andsubordinate computer ean make petroleum pumps operate safely in a rational working case with alower waste and greater runoff of the unit.