The reliability of network communication services is an important prerequisite for remote calibration of instruments.Due to different topology and scale of the communication network

the modeling and performance evaluation of the network behavior characteristics are challengeable

which makes the reliability of the communication network difficult to determine.The Dempster-Shafer evidence theory （DST） can effectively characterize uncertainties such as inaccuracy

incompleteness

and unreliability.Aiming at the uncertainty of remote calibration communication network of power meter

this paper proposes a network service quality uncertainty evaluation method based on the method of combined evidence fusion

this paper proposes a method for evaluating the uncertainty of network service quality of general remote calibration model.In view of the power remote calibration data service

audio （video） multimedia service

remote calibration Web service

and the different network QoS requirements in terms of reliability

security and real-time

areliability evaluation model based on theD-S evidence theory is constructed.OPNET is used to simulate and verify the network real-time communication

taking into account the qualitation and quantitation

objectivity and subjectivity. The reliability and effectiveness of the network communication of the calibration system are expounded

and the evaluation credibility is improved.