  Broadband spectral energy distributions (SEDs) are complied from literature
for 24 TeV BL Lac objects. Two SEDs, which are identified as low and high
states with their flux densities at $1\ {\rm TeV}$ ($F_{1 TeV}$), are available
for each of 11 objects. We fit the SEDs with the single-zone synchrotron +
synchrotron-self-Compton (SSC) model and determine the physical parameters of
the jets. The model well represents the SEDs, and the observed relation between
two peak frequencies $\nu_{\rm s}$ and $\nu_{\rm c}$ also favors the model. It
is found that the break of the electron spectrum ($\gamma_{\rm b}$) is
different among sources, but magnetic field strength distributes narrowly in
$0.1-0.6 $ G, indicating that the shocks in the jets are significantly
different among sources and the magnetic field may be independent of the
shocks. The ratio of $F_{1 TeV}$ is correlated with the ratio of the
$\gamma_{\rm b}$ in the low and high states, indicating that the relativistic
shocks in the jets may be responsible for the observed flux variations and the
spectral shift. The ratio of the two peak luminosities $L_{\rm c}/L_{\rm s}$ is
anti-correlated with $\nu_{\rm s}$ in the co-moving frame, which is possibly
due to the Klein-Nishina effect. No excess in the GeV band due to the
interaction between the TeV photons and the extragalactic background light is
observed, implying that the strength of the intergalactic magnetic field would
be much larger than $ 10^{-16}$ G. An anti-correlation between jet power and
the mass of the central black hole is observed, i.e., $P_{\rm jet}\propto
M^{-1}_{\rm BH}$, disfavoring the scenario of a pure accretion-driven jet. We
suggest that the spin energy extraction may be significant for powering jets in
these sources, implying that the black holes with smaller mass may spin more
rapidly.
