The composite HR diagram for luminous stars in our galaxy by Humphreys and McElroy(1984) is the only source which provides enough data for the comparison with the results of massive stars theoretical models. The luminosity limit for completeness of Humphreys' and McElroy's catalog(l984) is about MBol=−8 mag, when restricted to 3 Kpc from the Sun. Inside these limits there are 378 luminous stars in galactic associations and clusters, whose distances are known with sufficient reliability. The correspondent observational HR diagram is reproduced in Fig. 1. Synthetic HR diagrams for massive stars were constructed with the aim of reproducing the observed features for galactic luminous stars. By means of a Montecarlo technique, stars were randomly distributed in the MBol−Log Teff plane, weighted on the Salpeter's initial mass function and with a constant star formation rate.