  We report on the experimental realization of a ten-photon
Greenberger-Horne-Zeilinger state using thin BiB$_{3}$O$_{6}$ crystals. The
observed fidelity is $0.606\pm0.029$, demonstrating a genuine entanglement with
a standard deviation of 3.6 $\sigma$. This result is further verified using
$p$-value calculation, obtaining an upper bound of $3.7\times10^{-3}$ under an
assumed hypothesis test. Our experiment paves a new way to efficiently engineer
BiB$_{3}$O$_{6}$ crystal-based multi-photon entanglement systems, which
provides a promising platform for investigating advanced optical quantum
information processing tasks such as boson sampling, quantum error correction
and quantum-enhanced measurement.
