: The use of 3D fabrics as reinforcing element in composites is expanding due to several benefits such as reducing production costs and eliminating the problem of delamination among the different methods of fabric manufacturing , weft knitting technology has unique capabilities for producing 3D fabrics with complex structures. In this perusal , a new generation of multicellular weft knitted spacer fabrics has been designed which in addition to its applicability in various fields , has eradicated the structural restrictions of conventional multicellular spacer fabrics. This knitted structure is composed of two main layers intercon nected by incomplete hollow tangential pyramids . F abrics were knitted in two different geometries and heights on an electronic double bed flat knitting machine using high strength nylon yarn. Special molds were used to prevent sample deformation during the composite manufacturing process . The composite specimens were manufactured by vacuum bagging and resin spraying methods and the performance of these structures was investigated under compressive loading and three - point bending test. A simulation based on Vassiliadis model a pplied to study the distribution of compressive and tensile stresses on specimens in bending and compressi o n tests and their behavior was examined by finite element method . The effect of structural geometry and composite production metho d on its compressive and flexural properties were analyzed. The results showed a significant influence of the type of composite manufacturing process on the performance of these structures under compressive loading. The structure produced by the vacuum bag ging method has a better performance than the other specimens. Higher compressive modulus, fracture force and energy absorption were observed in these composites. These results are due to the higher volume fraction of resin in structures produced by vacuum bagging method and imperfections and more structural defects in resin spraying specimens. The results show that for a 10 mm reduction in structural height for the composite s produced by vacuum bagging method, the compressive strength increased by 1.9 time s and for the composite s produced by resin spraying method, it increased by 1.6 times. As the height increases, the critical force required for buckling decreases, so in samples with longer connecting layers , buckling occurs at lower force, thereby failure force reduc es . In the bending test, the short - height structures exhibited a sharp slope force - displacement curve but showed less fracture force than the higher - height structures. Unlike anticipation results also show that the specimens produced by resin s praying had a better bending performance due to the rapid buckling of the upper surface layer and the charge transfer on the bonding layer. The numerical model presented for predicting the bending and compressive behavior of structures has a good agreement with the experimental results