In this work we have investigated detailed electrical magnetic and structural studies and thermal hysteresis behavior on La 0.5 Ca 0.5 Mn 1-x Cr x O 3 ( x = 0.0, 0.002, 0.005, 0.01, 0.03 ) manganites. Riteveld analysis exhibited that all samples are isostructural in Pnma space group at 300 k. The experimental result indicate that mother’s body of La 0.5 Ca 0.5 MnO 3 has very complicated magnetic structure and with 3 percent Cr substitution , charg and orbital ordering of pure sample is destroyed.Substituation of Cr at Mn-site in La 0.5 Ca 0.5 MnO 3 decreas electrical resistivity and increase metal- isulator transition temperature ( T MI ) of sample. Another significant Cr doping effect is unstabilizes the charg ordered state and increases the ferromagnetic metallic ( FM ) state with small amount of substitution. The magnetization of pure sample show a counterclockwise hysteresis loop and doped samples exhibit a clockwise loop. The polycrystalline samples were synthesized by a mechanical method. Appropriat amount of La ( CH 3 COO ) 1.5 H 2 O, Ca ( NO 3 ) 2 . 4 H 2 O, C 4 H 6 MnO 4 .4H 2 O, C 6 H 7 O 8 . were mixed in proper stoichiometric and preheated at 600 o C for 5 h. Then samples ground and heated at 800 o C for 10 h.The powder obtained was annealed at 1000 o C for 2 h. Finaly the samples were pelletized and heated at 1350 o C for 10 h. With using powder diffraction patterns we checked phase purity of samples at room temperature. We performed Ritveld riefinment of the diffraction pattern by using the FULPROF programs. magnetization was measured by using ac susceptometr. Resistivity measurement were carrid out using prob technique to measure the dc resistivity between 30 and 300 k.