讨论了横向振动的分段均匀玻色闭弦的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.然后计算了两段和三段分段均匀玻色闭弦的Casimir能量,对有限温度情况下的Casimir能量进行了研究.最后就所得结果和有关问题进行了讨论.%In paper(Ⅰ), Casimir energy for bosonic strings(Ⅰ)-OPUBS,we have obtained the Casimir energy for the transverse oscillations of open piecewise uniform bosonic strings (OPUBS) with both untwisted or twisted continuous condition. In this paper,we will discuss the Casimir energy for closed piecevise uniform bosonic strings (CPUSB). After calculating the analytic values of zero's of the dispersion function under certain conditions,we obtain the Casimir energy for closed bosonic strings composed of tvo or three segments with both untwisted or twisted continuous condition. The Casinir energy at finite temperature is investigated too.
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