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Thanks to its significant value in anti-drought, Sabina vulgaris is becoming more and more important. But much of past research work was primarily focused on its eco-physiological characteristics while ignoring its basic topological architecture and growth rules. In this work, a dual-scale automaton model is presented to investigate the topological architecture of S. vulgaris shrubs. In comparison with the fractal approach, this model is a simpler and visually more effective method from agro-ecological, and is easier to understand and implement in programming. The result provides a feasible study on the dynamics of S. vulgaris growth, architecture and geometry in various drought environments.