Directly-connected test on dual-struts supersonic combustor fueled by liquid kerosene was made to test the influence of three different injection locations in upstream strut on combustion. The wall pressures were processed by one-dimensional impulse analysis method. Results showed that the position of thermal coking was influenced by the injection location in the upstream strut. Moreover

when fuel was injected respectively from the first and the second positions in upstream strut

the wall pressure distributions were nearly the same

but 6.3%-7.5% and 16.7%-17.4% higher than from the third injection location in conbustion efficiency and in thrust separately. Test results showed that fuel injected from the first injection position in the upstream strut could hold steady combustion but couldn't do from the third one. The results of simulation showed that the fuel had a high mixing efficiency with the air combusted steadily when the L≥80mm

where L was the distance between injection position and trail of strut.