Abstract: Electronic Swine Performance Testing System(ESPTS)has been widely used in many large-scale intensive pig farms in China.The data correctness of ESPTS is influenced by a series of factors.If the porcine growth performance data cannot be guaranteed to be correct,the efficiency and direction of breeding work will be affected and misled.This study found that the data correctness of ESPTS was affected by three fundamental factors:the systematic error,the random impacting factor generating during the equipment running,and the interfering factor associated with animal behavior.We also pointed out that the incorrect data were mainly observed in the following four aspects:data-chain interruption,feeding supplying interruption,mechanical sticking on scales,and abnormal animal behavior.Two aspects of work are recommended to be done for ensuring the data correctness:enhancing management so as to control the emerging of factors affecting the data correctness;analyzing and revising the incorrect data according to the actual situation.Data maintenance is one of the most important works in data quality management system of ESPTS.The scientific analysis and rational maintenance of the data obtained from ESPTS can objectively reveal the animal behavior to the largest extent,embody the significance of the testing data,and make the data be of practical significance in evaluation,application and communication.