The study focuses on the uniaxial compressive strength test by method Unconfined Compression test. Along with the study of micro structure of clay mixed with cement and bagasse ash as the image of the internal structure clod by SEM (Scanning Electron microscopy) to see the changes of the structure of clay after improving properties. And study materials and products made by XRD (X - ray Diffraction), which the results will be used to describe the relationship of compressive strength of single axis increases, and the change in the micro level.