ZUC-256 is a stream cipher developed in China for 5G communication and post-quantum， which mainly includes the ZUC-256 stream cipher and the integrity algorithm （EIA3）. This paper designs two kinds of hardware structures of ZUC-256 stream cipher and an EIA3 algorithm structure based on ZUC-256. And then the designed structures are implemented based on PFGA， and their performance is compared. Comparison results show that： The two new ZUC-256 designs reach a throughput of 6.72 Gb/s， which is 45.24% faster than the current ZUC-256 design， and they uses fewer resources than the previous ZUC-128 design， reducing the area by 38.48% and 30.90%， respectively. And the EIA3 algorithm based on ZUC-256 can complete encryption of 128 bit data within 0.71 μs.