  BL Lacertae objects (BL Lacs) is the dominant population of TeV emitting
blazars. In this work, we investigate whether there is any special
observational properties for TeV sources. To do so, we will compare the
observational properties of TeV detected BL Lacs (TeV BLs) and non-TeV detected
BL Lac objects (non-TeV BLs). From the 3rd $Fermi$/LAT catalog (3FGL), we can
get 662 BL Lacs, out of which, 47 are TeV BLs and 615 are non-TeV BLs. Their
multi-wavelength flux densities ($F_{\rm R}$, $F_{\rm O}$, $F_{\rm X}$,
$F_{\gamma}$), photon spectral indexes ($\alpha_{\rm X}^{\rm ph}$,
$\alpha_{\gamma}^{\rm ph}$), and effective spectral indexes ($\alpha_{\rm RO}$
and $\alpha_{\rm OX}$) are compiled from the available literatures. Then the
luminosities ($\log\,{\nu}L_{\rm R}$, $\log\,{\nu}L_{\rm O}$,
$\log\,{\nu}L_{\rm X}$, $\log\,{\nu}L_{\gamma}$) are calculated. From
comparisons, we found that TeV BLs are different from low-synchrotron-peaked
BLs (LSP) and intermediate-synchrotron-peaked BLs (ISP), but TeV BLs show
similar properties as high-synchrotron-peaked BLs (HSP). Therefore, we
concentrated on comparison between TeV HSP BLs and non-TeV HSP BLs. Analysis
results suggest that TeV HSP BLs and non-TeV HSP BLs show some differences in
their $\alpha_{\rm RO}$ and $\alpha_{\gamma}^{\rm ph}$, while their other
properties are quite similar.
