In this work the present day mass functions (PDMF) of T-Tauri Stars (TTS) which are in the pre-main sequence (PMS) evolutionary phase of their evolution in the Taurus-Auriga Molecular Cloud Complex have been calculated. For this purpose, by applying our modified stellar evolutionary code, stellar models in the mass range 0.1 - 2.5 M(circle dot) are used to determine the mass and age mass of TTS. The obtained mass function is compared with the mass function of Miller & Scabo (1979). The age found for TTS is around 1 - 3 x 10(6) yr and the mass function is about 0.644 -/+ 0.348. From these results, we have calculated the stellar birthrate as about 1.3 x 10(-7) M(circle dot) yr(-1) in this region.