Conventional controllable nuclear fusion technologies adopt high-temperature plasma collision modes for energy release, which rely on extreme temperatures of hundreds of millions of degrees and strong magnetic field confinement. They have inherent drawbacks such as high operating thresholds, huge system energy consumption, poor steady-state controllability and serious material activation, making it difficult to achieve commercial net energy gain for a long time. Based on the fundamental ternary structure theory of the universe, this paper constructs a brand-new low-temperature, room-temperature and precisely controllable dual resonant lattice coupling fusion system. The scheme adopts vacuum-isolated single-particle reaction units. A proton confinement device fixes a single bare proton at a time to isolate external particle interference. A matched coaxial electron emission gun realizes radial coaxial injection of electrons with zero angular momentum, and neutrons are generated in situ under normal temperature and low voltage through one-to-one precise embedding. There is no Coulomb barrier between protons and neutrons, and no high-temperature or high-speed excitation is required. Spontaneous instantaneous lattice resonance coupling occurs once particles get close to each other, automatically completing energy release at the nuclear level. Aiming at the problem of high-frequency high-energy radiation produced by reactions, this paper proposes a coherent down-conversion mechanism of multi-layer gradient dense dielectric spherical structures, which can fundamentally realize complete radiation confinement and full deposition conversion of energy. This paper only carries out deduction of underlying physical mechanisms and design of top-level system architecture. All engineering implementation details including vacuum timing control, beam calibration and cavity structure are independently optimized by application researchers. Completely breaking away from the dependence on extreme working conditions of traditional thermal fusion, this theory possesses prominent advantages such as barrier-free spontaneous fusion, no difficulty in neutron management and no long-lived radioactive contamination, opening up a new technical route for safe, low-cost and easily regulated controllable nuclear fusion.