The Raman spectra of different brands blue ballpoint pen ink marks were measured by confocal micro-Raman spectroscopic technique. The Raman spectra were excited with 514.5 nm radiation. According to characteristic Raman bands, intensities and its trend, we can simply and quickly identify the ink marks of different brands blue ballpoint pen. Many points were chosen to be measured from the same brand blue ballpoint pen ink marks, and the Raman spectra keep consistency. For the same brand blue ballpoint pen ink marks, we track to measure their Raman spectra for a year and a half and it is found that Raman spectra of the same brand blue ballpoint pen ink marks made in different time have certain regularity with time going on. These lay the foundation for the quantification of the time. The results will offer scientific evidence for court to identify the types of ink marks and provide sufficient evidence for the commits such as altering the signatures in the contracts. The methods have the advantages such as high-speed, simplicity, no pretreatment, and particularly non-destructiveness.