Abstract: In this paper, we construct MW R-S code based on Reed-Solomon code, this code belong to 2-D codes, its auto-relativity is zero and the cross-relativity is one. Analyzed the capacity of 2-D R-S code with λa=λa=λ=1 based on the Johnson boundary condition, compared with the code we constructed, it shows that the code we constructed is nearly optimal. And we carried on the datum analysis on the performance of the code in 2-D OCDMA system with only considering the multi-user interference, got the curves of BER via the number of simultaneous users in 2-D OCDMA system with different prime p. This result supplies important reference for the further theory investigation on 2-D OCDMA system.