Graphene oxides (GO) nanosheets were prepared with graphite as main raw materials by oxidizing reaction and ultrasonic dispersion. The testing results indicate that GO size is in the range of 30-900nm and the content of hydroxyl and carboxyl are 22.1% and 29.4%. The 0.03% according to cement weight is doped in cement composites, SEM results indicate that the whole cement matrix in cement composites has ordered dense microstructure with flower-liked patterns consisted by polyhedron-like crystals with interwarving and inserting. The flexural and compressive strength of the corresponding cement composites at 28 days increase 93.9% and 80.0%, respectively.