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The distributed space-time code based on algebra theory in cooperative systems discussed in this paper is linear, but it doesn't satisfy the design criterion of orthogonal and quasi orthogonal space-time code. First the collaborative channel model is established and then we design the distributed space-time block codes which base in the model of two transmitting antennas and two receiving antennas. The sphere decoding method is adopted. In the final the traditional code, the cooperative code, based on algebra theory code and based on algebra theory cooperative code are simulated on performance. Simulation results show that the distributed space-time code based on algebra theory in cooperative systems can reduce the bit error rate and improve system performance.