The magnetic property of double doped manganite Nd 0.5(1+x) Ca 0.5(1−x) Mn (1−x) Cr x O 3 with a fixed ratio of Mn 3+ :Mn 4+ =1:1 has been investigated. For the undoped sample, it undergoes one transition from charge disordering to charge ordering (CO) associated with paramagnetic (PM)-antiferromagnetic (AFM) phase transition at T<250K. The long range AFM ordering seems to form at 35K, rather than previously reported 150K. At low temperature, an asymmetrical M–H hysteresis loop occurs due to weak AFM coupling. For the doped samples, the substitution of Cr 3+ for Mn 3+ ions causes the increase of magnetization and the rise of T c . As the Cr 3+ concentration increases, the CO domain gradually becomes smaller and the CO melting process emerges. At low temperature, the FM superexchange interaction between Mn 3+ and Cr 3+ ions causes a magnetic upturn, namely, the second FM phase transition.