The improper setting of data sampling parameters will greatly reduce the measurement precision of cable tension using frequency method

because it is not propitious for the identification of fundamental frequency.On the basis of the analysis on the effects of data sampling parameters

i.e.sampling frequency and amount of sampling data

on the identification precision of fundamental frequency

and according to Nyquist law

an optimal matching method of setting data sampling parameters is put forward to improve the measurement precision

which has considered real-time measurement and limited storage capacity at the same time.The testing results of Masangxi Changjiang River Bridge prove that the measurement precision is improved by at least 2 times with this method

which has good application value in engineering.