The intelligent weighing instrument designed by use of the single chip computer is characterized by simple structune,reliable performance,accurate weighing and allround functions.What only one resistor was usde for the simulating input interface circuit can make accurate correction for increment,which has great advantage over the conventional three-chip operation amplifying circuit.The hardware of weighing system is reasonable in structure,and the software is advanced in design,which provides a good example for application of computer in the electronic balancer.