The initial residual stress of the polymer bonded explosive based on TATB and its distribution were tested by blind-hole drilling method. The effects of hole depth and time of strain record on the testing result and the effects of heating treatment on residual stress relaxation were studied. The results show that 3 mm hole depth and 10 min time of strain records are suitable experimental parameters. The residual stress reduces to about 50% and tends to be steady by heating treatment at 75 ℃ for 3 days.