To deal with the problem that the number of antennas increases when Quadrature Spatial Modulation (QSM) improves the transmission rate, which requires a lot of resources and makes it difficult to achieve, a two-dimensional Space Code Orthogonal Index Modulation (SCOIM) was proposed. The transmitter information bits were mapped to the Pseudo Noise (PN) code index, the antenna index and the modulation symbol respectively. The in-phase part and orthogonal part of the modulation symbol spreaded spectrum through selecting activated PN code respectively, and were transmitted by activated antennas respectively. Analysis and simulation results show that in the comparison experiments with QSM, the index resource of SCOIM can be saved at least half at the same transmission rate and the saving increases exponentially with the increase of transmission rate. What's more, SCOIM has a performance advantage of about 5 dB when the bit error rate is 10 ^-4.