Catalysis of KMgF 3 catalysts for Knoevenagel condensation were enhanced by synthesizing mechanochemically. The BET surface area and number of strongly basic site of KMgF 3 were increased by applying greater mechanical energy (higher rotation rate) in a mechano-chemical process. Their increases were caused by stronger mechano-chemical effects such as the micronization of the particles and the creation of lattice defect on the surface, resulted in resulted in the enhancement of catalytic activity of KMgF 3 for Knoevenagel condensation. The XPS analysis revealed that the element composition on the surface of KMgF 3 was similar with K 2 MgF 4 and indicated the possibility which the true active component for this reaction was K 2 MgF 4 rather than KMgF 3 . The kinetic measurements revealed that the Knoevenagel condensation catalyzed by KMgF 3 was regard as a rst order reaction and apparent activation energy was estimated at 55.8 kJmol -1 . A soluble component capable of acting as a catalyst was not present in the solution and the KMgF 3 acted as a true solid catalyst.