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An improved algorithm is presented to overcome the shortage of the domain decomposition algorithm based on equivalence principle for multiple bodies of revolutions (EPA-MBoR). In a dense distribution of non-coaxal bodies of revolution (BoRs) containing at least two very close BoRs, no matter how to establish sphere equivalence surfaces (ESs), they are intersecting. It violates the equivalence principle and causes error results. The improvement is introduced to overcome the defect. In the improved algorithm, a sphere ES cluster is built on each BoR instead of a single sphere ES. We can freely adjust the sphere ES clusters on each BoR to avoid the intersection among them. The numerical results verify the above improvement successfully overcomes the deficiency and show the improved algorithm inherits the high efficiency of the previous algorithm.