The Casimir energy for the transverse oscillations of open piecewise uniform bosonic strings(OPUBS) with either untwisted or twisted continuous condition is discussed. After calculating the analytic values of zero' s of the dispersion function under certain conditions, we obtain the Casimir energy for bosonic strings composed of two or three segments with both untwisted and twisted continuous conditions.%讨论了横向振动的分段均匀玻色开弦的Casimir能量.首先导出具有非扭和扭曲两种连接条件的色散关系,在此基础上计算出几种特殊情况的零点能量.然后应用广义黎曼函数正规化方法计算了两段和三段分段均匀玻色子开弦的Casimir能量,并对所得结果和有关问题进行了讨论.
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