Aiming at varying centroid and varying speed special condition of the inverting filter centrifuge,equipment vibration isolation system was computational designed for accurate measuring feed materiel quantity according to the principle of force and moment balance,so the influence of vibration on weight measurement could be avoided.The influence of feed quantity on the centroid of the device was analyzed,the linear relationship between the detection value and the feed quantity was deduced.The weight measurement system was designed.The application results show the weight measurement system is accurate,maximum filter cake output can be got by optimizing feeding mode with small quantities in high frequency.