  Although continuous-variable quantum secret sharing (CVQSS) has been
theoretically proven to be secure, it may still be vulnerable to various local
oscillator (LO)-aimed attacks. To close this loophole, we propose a practical
CVQSS scheme using local LO (LLO), which is called LLO-CVQSS. In this scheme,
LO is no longer generated by each user but can be locally generated by the
legitimate party, i.e., the dealer. This waives the necessity that all LOs have
to be transmitted through an untrusted channel, which makes CVQSS system
naturally immune to all LO-aimed attacks, greatly enhancing its practical
security. We also develop a specially designed phase compensation method for
LLO-CVQSS so that the phase noise of the whole system can be eliminated. We
finally construct a noise model for LLO-CVQSS and derive its security bound
against both eavesdroppers and dishonest users. Numerical simulation shows that
LLO-CVQSS is able to support 30 users at the same time and its maximal
transmission distance reaches 112 km, revealing that LLO-CVQSS is not only has
the ability to defend itself against all LO-aimed attacks but also has the
potential for building large-scale practical quantum communication networks.
