Abstract: The booster ring(BRing) of High Intensity heavy-ion Accelerator Facility(HIAF) is characterized by high intensity and high energy. Failures of key equipment such as magnets and RF system will lead to significant beam losses and damage to the accelerator. A beam dynamics simulation code BTracker is developed to study beam losses under equipment failures and beam dynamics during beam dumping for the HIAF machine protrection. With this code, beam loss distribution under power failure of dipole and quadrupole magnets is simulated, and the results are benchmarked with MAD-X code. In addition, BTracker provides user-friendliness, interface flexibility and high performance to meet the requirements of machine protection simulation for HIAF-BRing.