Quantum　channel　noise　may　cause　the　user　to　obtain　a　wrong　answer　and　thus　misunderstand　the　database　holder　for　existing　QKD-based　quantum　private　query　(QPQ)　protocols.　In　addition,　an　outside　attacker　may　conceal　his　attack　by　exploiting　the　channel　noise.　We　propose　a　new,　robust　QPQ　protocol　based　on　four-qubit　decoherence-free　(DF)　states.　In　contrast　to　existing　QPQ　protocols　against　channel　noise,　only　an　alternative　fixed　sequence　of　single-qubit　measurements　is　needed　by　the　user　(Alice)　to　measure　the　received　DF　states.　This　property　makes　it　easy　to　implement　the　proposed　protocol　by　exploiting　current　technologies.　Moreover,　to　retain　the　advantage　of　flexible　database　queries,　we　reconstruct　Alice＇s　measurement　operators　so　that　Alice　needs　only　conditioned　sequences　of　single-qubit　measurements.