Optical interconnection networks have important potential applications in the fields of super-computers and photonic switching network systems etc. Based on the prism gratings and the 65 ×65-array Dammann grating designed and fabricated by us, we implemented the 64 ×64 crossover interconnection functions by using free-space optical interconnection technology. Calculations about output patterns of crossover interconnection functions have been made, which are agreement with our experimental results.