A novel crystal of (1R,5S,6S)-6-[(1R)-1-hydroxyethyl]-2-[(3S,5S)-5-sulfamoylaminomethylpyrrolidin-3-yl]thio-1-methyl-1-carba-2-penem-3-carboxylic acid or a hydrate thereof (hereinafter, abbreviated as doripenem). In the diffraction pattern in powder X-ray diffraction, the crystal has main peaks at diffraction angles(2?)=6.46,15.27,16.41,17.49,20.72,23.05 and 25.38(degrees)±0.1. At room temperature, the crystal is more thermodynamically stable, its dissolubility is higher, the crystal can be produced in industry with simple process and lower cost. A medicament composition containing the novel crystal of doripenem, preparation method and the uses in the manufacture of a medicament for the prevention of infection thereof.