Statistical Analysis of Waiting Time Distribution and 'Memory' with repeating FRB 121102 and FRB201124A Wu, Qin At present, more and more repeating fast radio bursts (FRBs) have been observed. Especially, FAST has observed the window of high burst rates of repeating FRB 121102 and FRB201124 with its high resolution (Li et al. (2021), Xu et al. (2022)). Here we report the statistical analysis of waiting time distribution of FRB 121102 and FRB201124 using the Bayesian Blocks method. And we find the non-stationary processes can used to describe the waiting time of FRB 121102 and FRB201124. Furthermore, we study the flare rate of FRB at different time resolution and find that there is FRB 'Memory' from seconds to half-minute.