A 3D hollow composite with "X" core structure was designed and composited. Compression characteristic and property of 3D hollow composite were tested by Instron 3385H, and the stress-strain curve was obtained. According to structure parameter of the composite, the structural model was established. Static properties of the composite are simulated by ANSYS Workbench. Simulated result is compared to the testing result. The result showed that the main loads were supported by core structure of composite and the main failure occurred there. Simulated results approximately agree with the experimental, the models have certain veracity.