Developmental duration, predation rate, reproduction and life table parameters of Phytoseiulus persimilis Athias-Hcmiot on  the  four  tetranychid  mites:  Tetranychus  urticae  Koch.,  Oligonychus  sayedi  Zaher,  Gomaa  &  EI-Enany, Eotelranychus zacheri Zaher, Gomaa & EI-Enany, and Petrobia tritici Kandeel, EI-Naggar & Mohamed. were studied at 25 ± 2°C and 70 ± 5% R.H.  P. persimilis was able to feed and complete its development on the four tested preys. The predator exhibit a particularly high capacity for increase when fed on T. urticae and O. sayedi, feeding on P. tritici, enhanced poor predator performance as significant longer life cycle and decrease in  adult female longevity and no eggs laying occurred. The period of adult female longevity increased to 24.1 days when fed on T urticae comparing to 23.4 & 14.2 days when fed  on O. sayedi and E.  zacheri, respectively.  The result showed that low capacity of predator population growth suggests poor ability of P. persimilis to suppress E. zacheri and P. tritici populations on commercial crops. The daily multiplication rate (R0/T) and the intrinsic rate increase (r_m) revealed that highest rate of P. persimilis fed on T. urticae which averaged 2.51 and 0.12, respectively.