**Table 2:** Observation summary of 20 $\delta$ Scuti type variable stars and 1 RRa in ROTSE-I field. Last two columns represent the identifications of ROTSE-I group and ours.
$\begin{table} \par \begin{tabular}{17cm}{lcccccll} \noalign{\smallskip } \hline... ...7167 & 2451280.348 & DS & Non-variable\\ \hline \end{tabular}\par\end{table}$

^a: DY Her was classified as RR Lyr type stars (GCVS). But It was identified as a HADS (Hoffmeister et al. 1985).
^b: It is a well-known $\delta$ Scuti star, YZ Boo.
^c: It was also observed by Wils et al. (2002).
^d: It is a well-known cataclysmic variable star, AM Her.

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