In past years, two/three-layer hydrogen targets with a composition of H/D/T at temperature ~3K have been studied for muon catalyzed fusion. Several theoretical and experimental studies have evaluated that the conversion efficiency of fast muons in such targets is very low. Here, the muon cycling coefficient has been determined for the heterogeneous target of the muon cycling coefficient by the reason of slow muon cycles in the third layer of D H . The optimal muon cycling coefficient equals 87.5.