The non-contact detection technology based on electromagnetic radiation signal by using external antenna is focused on in location of partial discharge source.However

because of the signal attenuation and the background noise and inference

the signal to noise ratio（SNR） of the mesured partial discharge signal often decreases obviously when the detection distance increases.Therefore

in order to improve the remote detection performance of the non-contact method

we proposed an accumulation method based on double antennas measurement and cross-correlation estimation information

in which the detection of aperiodic weak partial discharge signal was translated to the estimation of periodic time delay parameters

thus the long time accmulation method could be applied to detection and location of the partial discharge source.The simulation and experiment anlaysis were conducted to test its feasibility.The results show that

with the low SNR

the accmulation of cross correlation estimation information can restrain the influence from noise and interference effectively

and its detection performance improves as the accumulation times increase; the accuracy rate of the time delay estimation with cross correlation information accmulation is higher than that without accmulation for the partial discharge on the same conditions.So

this accmulation method can be used for the time difference of arrival（TDOA） system to improve its remote detection performance for the partical discharge source.