Rapidly Increase Of Sys-aux?

when i check the free space of tablespaces,i found that sysaux increase so rapidly that i must increate in less than a week!when i checked the sysaux using v$sysaux_occupants ,and i found than

   select occupant_name,space_usage_kbytes from v$sysaux_occupants;

the result :
   OCCUPANT_NAME                                                                    SPACE_USAGE_KBYTES
    SM/AWR                                                                                       3159680

[code]...

i also use the package: exec dbms_workload_repository.drop_snapshot_range(),it din't work!!!!

in my test db,i rebuild awr,it works ,but is there any risk to rebuild in my real db?