The compatibilities of dihydroxylammonium 5, 5′-bistetrazole-1, 1′-diolate(HATO) with composite modified double base(CMDB) propellant components, including nitrocellulose(NC), NC/nitroglycerine(NG) absorbent, N-nitrodihydroxyethylaminedinitrate(DINA), cyclotrimethylene-trinitramine(RDX), cyclotetramethylenete-tranitramine(HMX), lead 3-nitro-1, 2, 4-triazole-5-onate(NTO-Pb) and aluminum powder(Al powder) were studied by differential scanning calorimetry(DSC) and vacuum stability test(VST) method.DSC results show that the binary systems of HATO with NC, NC/NG, DINA, and RDX are incompatible, with HMX, NTO-Pb and Al powder are compatible.VST results show that the binary systems of HATO with NC/NG absorbent and DINA are incompatible, with RDX is slightly sensitive, and with NC is compatible.