  We present our piggyback search for fast radio bursts using the Nanshan 26m
Radio Telescope and the Kunming 40m Radio Telescope. The observations are
performed in the L-band from 1380 MHz to 1700 MHz at Nanshan and S-band from
2170 MHz to 2310 MHz at Kunming. We built the \textsc{Roach2}-based FFT
spectrometer and developed the real-time transient search software. We
introduce a new radio interference mitigation technique named \emph{zero-DM
matched filter} and give the formula of the signal-to-noise ratio loss in the
transient search. Though we have no positive detection of bursts in about 1600
and 2400 hours data at Nanshan and Kunming respectively, an intriguing peryton
was detected at Nanshan, from which hundreds of bursts were recorded. Perytons
are terrestrial radio signals that mimic celestial fast radio bursts. They were
first reported at Parkes and identified as microwave oven interferences later.
The bursts detected at Nanshan show similar frequency swept emission and have
double-peaked profiles. They appeared in different sky regions in about tens of
minutes observations and the dispersion measure index is not exactly 2, which
indicates the terrestrial origin. The peryton differs drastically from the
known perytons detected at Parkes, because it appeared in a precise period of
$p=1.71287\pm 0.00004$ s. Its origin remains unknown.
