In order to consider the speed and precision simultaneously in dynamic weighing system

the problem of dynamic weighing is resolved through parameter identification based on least square method and forecast method.The dynamic weighing system is equivalent to two orders system that is non-linearity time variable system

dynamic mathematic model is established by analysis.According to the system model

parameter identification method of adaptive least square based on Householder transformation is adopted.The Householder transformations have some advantages

for example

anti ill function

higher stability

higher precision

fewer calculation amount and good trace ability.The method adopted is feasible by prove of experiment result.Through the method

the technology requests are achieved

the relative error of measurement is less than 0.25 %FS and the accuracy in the full scale is no less than（0.25 %）;Not only the weighing speed but also precision are achieved.The method have the reference value for the practicality development of the similar weighing system to a great extent.