The biology of Phytoseiulus macropilis and Typhlodrompis capisicum ted  on three  preys; Tetranychus urticae, Panonychus ulmi and Eutetranychus orientalis was studied at 27°C. Total consumption, as well as predation capacity was estimated. T urticae was more favorable than the other prey for P.  macropilis, its  fecundity was (3 1.06,  20.53  and 13.93eggs to T. urticae, E. oriantalis and P. ulmi, respectively. No significant differences in the fecundity of T. capisicum when ted on T. urticae and E. oriantalis, 21.38 and 19.73 eggs, respectively. The life cycle duration was shorter (11.60 days) when P. macropilis ted on T. urticae than the other two preys, 17.93 days and 21.40 days for E. oriantalis and P. ulmi, respectively; while no significant differences in  life  cycle duration of T. capisicum when ted on T. urticae and E. orientalis being shorter compared with feeding on P.  ulmi which increased the life  cycle. The consumption rate of predators increased with increasing prey densities at three levels 5, 10 and 15  individuals for both predators. Also, deposited eggs of the two predators increased by increasing tood.Net reproductive rate (Ro) and Intrinsic rate of increase (rm)  values were the best values when P.  macropilis fed on T. urticae and the mean generation time  (T) decreased compared with the other preys.