In view of the complexity and uncertainty of the security assessment of tower crane, the paper puts forward the D--S evidence theory to evaluate the safety condition of in-service tower crane, and establishes security risk evaluation system of tower crane. Through actual example calculation, it testifies the feasibility, effectiveness and adaptability of the D--S evidence theory in the security assessment of tower crane.%针对塔式起重机安全评价的复杂性和不确定性，提出采用D—S证据理论对服役塔吊的安全工况进行评价，建立了塔吊安全风险评价指标体系，通过实例计算，验证了该方法在塔式起重机安全评价中具有可行性、有效性和适用性。
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