  Fast radio bursts (FRBs) are millisecond-duration radio signals occurring at
cosmological distances. However the physical model of FRBs is mystery, many
models have been proposed. Here we study the frequency distributions of peak
flux, fluence, duration and waiting time for the repeating FRB 121102. The
cumulative distributions of peak flux, fluence and duration show power-law
forms. The waiting time distribution also shows power-law distribution, and is
consistent with a non-stationary Poisson process. These distributions are
similar as those of soft gamma repeaters (SGRs). We also use the statistical
results to test the proposed models for FRBs. These distributions are
consistent with the predictions from avalanche models of slowly driven
nonlinear dissipative systems.
