With the development of GSM network

data traffic is growing rapidly

and taking over more and more proportion.At present

the conventional method of frequency optimization only consider the influence of speech traffic

which may lead to difficulty to assign the frequency of low interference to cells with low speech and high data service due to their lower frequency weight

and will affect the data service quality.Therefore it’s necessary to carry out studies on GSM frequency optimization correlated with data and speech traffic.First in-depth study of calculation method of frequency load of three services

CS

GPRS and EGPRS

to quantify the frequency interference contribution

and then frequency experiment considering data and speech traffic can find out conclusion that considering data traffic frequency weight in optimization can greatly enhance the data service quality and make voice service quality remained stable in the high data traffic area.This research can play a guiding role for the future to enhance the quality of the network.