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提出了含Ｒ、Ｐ副空间连杆机构摆动力完全平衡的质量矩替代法，将含Ｒ、Ｐ副空间连杆机构摆动力的完全平衡简化为ＲＲ构件、ＰＲ－ＲＲ构件组、全Ｒ副空间开链的质量矩替代。本文着重导出了ＲＲ构件、ＰＲ－ＲＲ构件组、全Ｒ副空间开链的质量矩替代条件与公式。由这些质量矩替代条件与公式，按照本文第（二）部分给出的含Ｒ、Ｐ副空间连杆机构摆动力完全平衡条件的构造步骤，可直接构造出一般含Ｒ、Ｐ副空间机构的摆动力完全平衡条件，使得这类机构摆动力完全平衡条件的建立过程大为简化。
A mass moment substitution method is proposed to completely balance the oscillating force of the R, P space-spider mechanism. The complete balance of the oscillating forces of the R, P subspace spatial linkage mechanism is reduced to RR components. The PR-RR component group, Mass moment of open chain replacement. In this paper, the mass moment substitution conditions and formulas of RR component, PR-RR component group and all R secondary space are emphatically deduced. According to the construction steps of the conditions of complete balance of rocking force of R, P sub-spatial linkage mechanism given in part (b) of this paper, the conditions and formulas of replacing mass moments can be used to directly construct the general R Complete balance of the swing force conditions, making the complete balance of these institutions swing force the establishment of the process is greatly simplified.