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In this paper, relay node deployment strategies are adopted into heterogeneous network scenario. The existence of cooperative relay nodes introduces more interference in the cellular domain. Firstly, we give the hetero-interference models which have great influence on heterogeneous access performance. Furthermore, outage probability and symbol error rate formula are derived under heterogeneous relay network. On this basis, Nearest-Neighbor algorithm and fixed deployment strategy are adopted to analyze cooperative network performance. Numerical results show that the Nearest-Neighbor solution can effectively improve the cellular performance in the heterogeneous environment.