Abstract
Taiwan Earthshine and AsteroSeimology Telescope Network (EAST) is a global network that will be come true. Asteroseimology, one science topic of EAST network, need continuous data to analyze frequency of flux variation of stars. And, longer total lenghth of data is better for frequency analysis. So global network is a feasible scheme. Now, the first system of EAST had been established at Teide Observatory, Tenerife, Canary Island, Spain. EAST station can work automatically or controlled reomtely through the Internet. And the second system will be established in Uzbekistan this summer. In this thesis, a data reduction procedure of EAST system is presented. We develope some methods to remove signal not from stars. And two procedures, finding stars and photometry is developed for image analysis. Finally, we plot the light curve and analyze frequency of variation of light curve, using fast fourier transform. We observe three δ Scuti stars, BI CMi, V350 Peg and V830 Her. For BI CMi, we can roughly find period of 0.12 day in the light curve. For V350 Peg, we can roughly find period of 0.175 day in the light curve. And a period of 0.2 day is given by FFT. It isn't believable enough because leakage. For V830 Her, we can roughly find period of 0.18 day in the light curve. And a period of 0.1734 day is given by FFT. It match known period from the hipparcos catalogue. We observe one β Cephei star, LR Gem. For LR Gem, we has poor data to check its period. Besides, A suspected variable star, GSC 2102-1429 is presented. We suspect a period of 0.15 ~ 0.2 day for GSC 2102-1429.