Abstract: It is analyzed the impartiality of waiting time during message grouping in the polling system with gated services.Our analysis is based on the generating function and stochastic process methods.The variances of waiting during message grouping are compared with respect to the strategies under FIFO and FILO rules respectively.Consequertly,the analysis proves that the waiting time under FIFO has better impartiality than that under FILO in the polling system with gated services.