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We present preliminary results of our \hst Pa$\alpha$ survey of the GalacticCenter (\gc), which maps the central 0.65$\times$0.25 degrees around Sgr A*.This survey provides us with a more complete inventory of massive stars withinthe \gc, compared to previous observations. We find 157 Pa$\alpha$ emittingsources, which are evolved massive stars. Half of them are located outside ofthree young massive star clusters near Sgr A*. The loosely spatial distributionof these field sources suggests that they are within less massive starclusters/groups, compared to the three massive ones. Our Pa$\alpha$ mosaic notonly resolves previously well-known large-scale filaments into fine structures,but also reveals many new extended objects, such as bow shocks and H IIregions. In particular, we find two regions with large-scale Pa$\alpha$ diffuseemission and tens of Pa$\alpha$ emitting sources in the negative Galacticlongitude suggesting recent star formation activities, which were not knownpreviously. Furthermore, in our survey, we detect $\sim$0.6 million stars, mostof which are red giants or AGB stars. Comparisons of the magnitude distributionin 1.90 $\mu$m and those from the stellar evolutionary tracks with differentstar formation histories suggest an episode of star formation process about 350Myr ago in the \gc .

HST Palpha Survey of the Galactic Center -- Searching the missing young stellar populations within the Galactic Center