We reconsider the thermal scalar Casimir effect for p-dimensional hypercubic cavity inside D+1-dimensional Minkowski space-time.The thermal Casimir free energy can be divided into the divergent zero-temperature part and the automatically finite temperature-dependent part through standard quantum field theory treatments.Due to the finiteness,the regularization of the temperature-dependent part,which is also required for the convergency of the Casimir energy and the vanishing of the Casimir force with the separation increasing to infinity,is neglected in some literatures.We derive rigorously the regularization of the zero temperature part as well as the temperature-dependent part of the free energy by making use of the zeta function technique and the Abel-Plana formula.In the ca-ses of D=3 ,p=1 and D=3 ,p=3 ,we precisely recover the results of parallel plates and three-di-mensional box in the literature.And explicit expressions of the Casimir free energy in both low tem-perature (small separations)and high temperature (large separations)regimes are given,through which we find that after the regularization of both parts,with the side length going to infinity the force always tends to zero for different boundary conditions.Our study may be helpful in providing a com-prehensive and complete understanding of this old problem.%重新考虑了D＋1维闵可夫斯基时空中p维超立方体腔里的标量场的热卡西米尔效应。经过标准的量子场论方法处理后，热卡西米尔自由能可以分为零温部分和有限的与温度有关的部分。在此前的一些文献中，由于含温度的部分自身是有限的，这部分的正则化被忽视了，而无穷远处卡西米尔能量的收敛性以及卡西米尔力的消失又要求对这部分进行正则化。利用Zeta函数方法和Abel-Plana公式，严格推导了自由能零温部分和含温部分的正则化。在D＝3，p＝1和D＝p＝3的情况下准确地恢复了文献中平行板和三维盒子的结果。并且给出了卡西米尔自由能高温（大间隔）和低温（小间隔）展开的精确表达式，并由此验证了在零温和含温两部分自由能都正则化后，对于不同的边界条件，在无穷远处卡西米尔力总是趋于零。
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