Recently,the State Administration for Entry-Exit Inspection and Quarantine and Shandong Province Administration for Entry-Exit Inspection and Quarantine have completely tested the PLC which is our ordinary electrical control system of the shot blasting machine.Through test about more than 10 coefficients including the electrical components,the voltage,insulation and the electric resistance of the wire,and the waterproof,dustproof and antisepsis of the electric control box,the results all reach the standard of the exported eletric.