The present paper illustrates a study on composite light weight lattice structure called as IsoTruss. Finite element modelling and simulation is carried out to observe the buckling characteristics of IsoTruss. Comparison of compressive buckling load carrying capacity is done for different bay lengths and different diameters of IsoTruss. The study concludes that the IsoTruss with same diameter yields maximum critical buckling load when global and local buckling is observed simultaneously. For maximum critical buckling load bay length decreases with increase in diameter of isotruss. The present paper illustrates a study on composite light weight lattice structure called as IsoTruss. Finite element modelling and simulation is carried out to observe the buckling characteristics of IsoTruss. Comparison of compressive buckling load carrying capacity is done for different bay lengths and different diameters of IsoTruss. The study concludes that the IsoTruss with same diameter yields maximum critical buckling load when global and local buckling is observed simultaneously. For maximum critical buckling load bay length decreases with increase in diameter of isotruss.