：经典的BLP模型是在计算机安全系统中实现多级安全性支持的基础，被视作基本安全公

理．BLP模型采用“强制存取控制”和“自主存取控制”来实现其安全性，总结了BLP模型的“公理

化描述”、“有限状态机模型描述”和“信息流的格模型描述”三种不同描述方法，分析了其BLP模型

目前存在的安全缺陷主要是：安全级定义的不完备性、信息完整性缺陷、时域安全性缺陷和隐通

道．在对BLP模型的改进中，影响较大的主要有BLDM 与MBLP两种模型，-: BLP model is a classic computer security systems in the multi-level security support of the foundation, be regarded as basic security axiom. BLP model is a " mandatory access control"　and " independent access control"　to achieve its security, summed up the BLP model, " axiomatic descr iption" , " finite state machine model descr iption"　and " information flow lattice model to describe the"　three different method for describing the BLP model and analyzes its current security flaws are mainly: the definition of incomplete security level, information integrity defects, time-domain security flaws and covert channels. Improvement in the BLP model, the impact of the larger main BLDM with MBLP two models