Aluminum 2124 alloy with different volume fraction of Sicp (5%, 10%, 15%) composites were prepared by Squeeze casting. The hot pressing was used to improve the fracture characteristics of Al 2124/Si Cpcomposites. The composites with different volume fraction of Sicp (5%, 10%, and 15%) were compressed and measured in different conditions. The test result are compared with Ansys simulated result and mathematical result. The constitutive mathematical equations can be used for to prediction of fracture toughness for 2124 Al composites with different percentage volume of Sicp. Results showed that Fracture toughness is increases with increase in volume fraction of Sicp,