The formation process of calcium oxalate crystals in the agar-gel system was observed and recorded.Various calcium oxalate crystals were characterized using powder X-ray diffraction,infrared spectra and biomicroscope with digital camera.The results showed that varied morphogenesis crystal including monodinic monohydrate (COM), tetragonal dihydrate (COD) and triclinic trihydrate (COT) were produced in the agar-gel system.Among them,the proportion of COT is the largest while the proportion of COD is the small...