A novel Mesh optical interconnection board configuration in free-space is considered in this paper. Based on Mesh optical interconnection topology principle, this design is specially designed for integrated chip interconnection on high performance occasion as tiny satellites. The system uses VCSELs as electronic-to-optics converter modules to implement conversion between electronic signals and optical ones. Then optical signals, which have better anti-interference than electronic signals, propagate in free-space in a robust way. And at the interconnected chip side, which could only process electronic signals, optical signals are needed to be converted by PIN arrays into electronic ones. All interconnections are skillfully finished by certain cube prisms and inclined 45o reflecting mirrors and limited on the optical-waveguide layer inserted in a PCB board. This paper emphasizes on the configuration of an interconnecting unit (considered as a processing element) and its connecting manner. The design aims at light-weight, small-bulk, great anti-interference, advantages at better robustness, lager throughput, especially suitable for data switch, data propagation and IC interconnection on the tiny satellite.