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The synthesis of a composite series of Kaolin / Zeolite LTA were synthesized out through crystalline phase mixing and heating process at various temperatures. The composite syntesized were characterized by using SEM, XRD and FTIR, TGA and surface area analyzer. XRD analysis showed that crystal structure and amorphous phaseformed due to heating. The increasing of calcination temperature decreases LTA crystallinity significantly in line with increasing of temperature. Meanwhile FTIR spectroscopy provides information on changes in functional groups due to heating. TGA provides information on the amount of mass lost during heating due to the release of functional groups on LTA zeolite. Meanwhile N2 physisorption showed information on decreasing surface area due to increased temperature as a result of decreasing of pore volume due to heating. The calcination temperature of composites changes the composite pore structure