In this Master's Thesis I search for chemically peculiar stars of the upper main sequence in 14468 precalibrated, low resolution spectra from stars in three CoRoT ("COnvection, ROtation and planetary Transits", space telescope) fields. Low quality spectra have been removed from the three samples of spectra because they contain too low signals, too many negative counts or rectangular-like patterns. Bad counts in the spectra have been cut out and interpolated. Spectra containing wave-like

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... have been removed from the samples. A basic algorithm to compute the radial velocities and the rest frame wavelengths of the spectra has been applied. The spectral types are derived via "MKCLASS" (a stellar spectral classification program) or taken from already published results. Photometric magnitudes of the spectra are computed for two similar photometric systems (Delta a, Delta a'), a Delta a and a Delta a' analysis is carried out for each of the three samples. The statistical outliers are investigated manually to confirm the chemical peculiarities or reject false detections. By doing so, 15 stars which are most likely chemically peculiar stars and further 158 stars which are possible chemically peculiar stars have been found.