We obtain the magnetic phase diagram of perovskite Mn oxides at low tempera
tures. Our results show that when temperature T --> 0 a spiral state is sta
ble in a lower doping concentration, a canted state is stable in a higher d
oping concentration and a ferromagnetic (FM) state becomes stable in the in
termediate doping concentration. With temperature increasing, a paramagneti
c (PM) state appears at the higher doping concentration and then the canted
state disappears.