The large scale weighing system is often difficult to achieve portable and high precision,while the high precision weighing system has a smaller measuring range.In this paper,an electronic weighing system with the advantages of high precision,large range, portable and low cost is designed by using the force conversion structure and the improved Wheatstone bridge and the fast and high resolution signal acquisition and processing technology.The measured results show that the weighing range of the designed electronic weighing system is 0~8 kN,the error is less than 0.1%,and the threshold and resolution is 0.1 kg. It can be applied to scientific research,construction sites,livestock trading and other fields.