  Tsinghua University-Ma Huateng Telescopes for Survey (TMTS), located at
Xinglong Station of NAOC, has a field of view upto 18 deg^2. The TMTS has
started to monitor the LAMOST sky areas since 2020, with the uninterrupted
observations lasting for about 6 hours on average for each sky area and a
cadence of about 1 minute. Here we introduce the data analysis and preliminary
scientific results for the first-year observations, which covered 188 LAMOST
plates ( about 1970 deg^2). These observations have generated over 4.9 million
uninterrupted light curves, with at least 100 epochs for each of them. These
light curves correspond to 4.26 million Gaia-DR2 sources, among which 285
thousand sources are found to have multi-epoch spectra from the LAMOST. By
analysing these light curves with the Lomb-Scargle periodograms, we identify
more than 3700 periodic variable star candidates with periods below 7.5 hours,
primarily consisting of eclipsing binaries and Delta Scuti stars. Those
short-period binaries will provide important constraints on theories of binary
evolution and possible sources for space gravitational wave experiments in the
future. Moreover, we also identified 42 flare stars by searching
rapidly-evolving signals in the light curves. The densely-sampled light curves
from the TMTS allow us to better quantify the shapes and durations for these
flares.
