Quantum conference key negotiation method with parameter independent channel

The invention relates to a quantum conference key agreement method with a parameter independent channel, which comprises the following steps: N participants, Alice being a conference initiator, Aj (j = 1, 2... N-1) being conference participants, Alice preparing 2L * (N-1) non-maximally entangled GHZ state particle pairs, dividing the particles into (N-1) sequences, each sequence corresponding to one participant, then the initiator divides the particles in each sequence into two groups of # imgabs0 # and # imgabs1 # and sends # imgabs2 # to participants corresponding to each sequence through a quantum channel, and all participants perform Bell measurement on the particles held by themselves to obtain common Mj between Alice and each participant; and finally, the Alice operates # imgabs3 # and sends the # imgabs3 # to the corresponding participants through a quantum channel for Bell measurement, so that all participants can obtain a key Kj of each participant Aj and the Alice and a shared key K equally shared b