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High entropy alloys (HEAs) based on transition metals display rich magnetic characteristics,however attempts on their application in energy efficient technologies remain scarce.Here,we explore the magne-tocaloric application for a series ofMnxCr0.3 Fe0.5Co0.2Ni0.5Al0.3 (0.8 ＜ x ＜ 1.1) HEAs by integrated theoretical and experimental methods.Both theory and experiment indicate the designed HEAs have the Curie tem-perature close to room temperature and is tunable with Mn concentration.A non-monotonic evolution is observed for both the entropy change and the relative cooling power with changing Mn concentration.The underlying atomic mechanism is found to primarily emerge from the complex impact of Mn on mag-netism.Advanced magnetocaloric properties can be achieved by tuning Mn concentration in combination with controlling structural phase stability for the designed HEAs.