Quantization　theory　gives　rise　to　transverse　phonons　for　the　traditional　Coulomb　gauge　condition　and　to　scalar　and　longitudinal　photons　for　the　Lorentz　gauge　condition.　We　describe　a　new　approach　to　quantize　the　general　singular　QED　system　by　decomposing　a　general　gauge　potential　into　two　orthogonal　components　in　general　field　theory,　which　preserves　scalar　and　longitudinal　photons.　Using　these　two　orthogonal　components,　we　obtain　an　expansion　of　the　gauge-invariant　Lagrangian　density,　from　which　we　deduce　the　two　orthogonal　canonical　momenta　conjugate　to　the　two　components　of　the　gauge　potential.　We　then　obtain　the　canonical　Hamiltonian　in　the　phase　space　and　deduce　the　inherent　constraints.　In　terms　of　the　naturally　deduced　gauge　condition,　the　quantization　results　are　exactly　consistent　with　those　in　the　traditional　Coulomb　gauge　condition　and　superior　to　those　in　the　Lorentz　gauge　condition.　Moreover,　we　find　that　all　the　nonvanishing　quantum　commutators　are　permanently　gauge-invariant.　A　system　can　only　be　measured　in　physical　experiments　when　it　is　gauge-invariant.　The　vanishing　longitudinal　vector　potential　means　that　the　gauge　invariance　of　the　general　QED　system　cannot　be　retained.　This　is　similar　to　the　nucleon　spin　crisis　dilemma,　which　is　an　example　of　a　physical　quantity　that　cannot　be　exactly　measured　experimentally.　However,　the　theory　here　solves　this　dilemma　by　keeping　the　gauge　invariance　of　the　general　QED　system.　Crown　Copyright　(C)　2013　Published　by　Elsevier　Inc.　All　rights