Abstract: Considering that in networks with parallel relays, complex field network coding-based parallel relay scheme (CFNC-PR) has larger transmission delay and detection complexity of destination, an optimization design scheme for complex field network coding is proposed. Performance analysis and simulation results show that, on the premise that network throughput and diversity gain are not lost, the scheme remarkably decreases the transmission delay of source symbols, reduces the detection complexity of destination. Compared with CFNC-PR, the symbol error probability of the scheme is reduced at a certain extent.