Traditional on-chip electrical interconnection has been unable to meet the increasing communication demands of multi-core processing systems.On-chip optical interconnection,which has advantages in terms of delay,energy consumption,and bandwidth,has gradually attracted attention.In order to reduce the hardware overhead of optical network-on-chip (ONoC) and improve the performance of the optical network,this paper proposes a 16-port passive H-tree optical interconnection network based on a microring resonator.The broadband micro-ring resonators is used to design 4 sets of steering optical routers,the use of micro-ring resonators is reduced and port selection is completed,and signals is transmitted to 8-port receiving optical routers and 3-level and 4-level optical switches to meet the contention-free transmission of signals.The experimental results show that compared with passive network structures such as Crossbar,λ〖ＷＴＢＺ〗-Router,GWOR,LACE,and Light,the passive optical H-tree network only needs 72 microring resonators at the 16×16 array scale.The average network insertion loss is 1.49 dB,which is reduced by 21.5%,10.7%,and 59.7% respectively compared with λ-Router,GWOR,and TAONoC.The average signal-to-noise ratio of each path reaches 17.48 dB,which is compared with λ-Router,GWOR,and Light respectively,increased by 38.5%,36.0%,and 17.1%.