CCD Time-Resolved Photometry of Four Newly Discovered CVs

We present time-resolved optical light curves in R bands obtained from differential photometry on sequential CCD frams of 4 new discovered high galactic latitude CVs, which are discovered by our spect roscopic observations of the optical identification of ROSAT X-ray sources.The analysis of the lig ht curves shows repeatable periodicity in these objects.J020348.7+295921 exhibits 0.5m variation with orbital period of 258 min.J062518.2+733433 reveals a 0.3 mag modulation with orbital period of 254min.J230949.6+213523 shows probably both orbital period of 207 min and WD spin period of 25 min.J232953.9+062814 present short period of 32min, indicating a magnetic system.