Abstract: A series of x%Mn:CsCdCl₃ perovskite materials were synthesized by a simple solvent method at room temperature, and the structure and optical properties of the CsCdCl₃ with different Mn²⁺ ion doping concentration were studied through the characterization of the structure and optical properties. On this basis, the A-site Rb alloying further regulates its optical properties. The results show that low-concentration Mn²⁺ ion doping can effectively enhance the photoluminescence (PL) emission intensity of CsCdCl₃, and the intensity reaches the maximum when the Mn²⁺ ion doping concentration is 1%. Further, Rb alloying at the A site show that the introduction of a small amount of Rb⁺ ions can further enhance the PL quantum yields (QY) of CsCdCl₃, reaching the maximum when the Cs/Rb ratio is 3:1. In addition, compared with the PL intensity after treatment for 5 h in an environment with a relative humidity of 100%, the stability of alloyed 1%Mn:Cs_0.75Rb_0.25CdCl₃ sample has a relatively higher level than the unalloyed 1%Mn:CsCdCl₃ sample.