The invention discloses a pre-coding matrix generation method which includes steps: a user terminal selects pre-coding vector in pre-set nonorthogonal codebook; the user terminal transmits selected pre-coding vector to a network side; the network side generates pre-coding matrix according with pre-coding vector transmitted by the user terminal. The invention also discloses a pre-coding matrix generating system. Pairing success probability of the network side is increased by using design scheme based on nonorthogonal grouping codebook.