Following Anderson's recent investigation, the theoretical description of generating entangled light through type Ⅱ phase-matched doubling process is presented. Entanglement type, entanglement rate and relation between entanglement rate and pump power are derived. The nonlinear crystal is type Ⅱ noncritical phase-matched KTP, and the resonant cavity is a monolithic, single ended, standing wave cavity. For the overlapping of the incident light and reflect light the entangled light cannot be retrieved from the cavity directly. They have to be retrieved in the form of a pair of coupled squeezed light, and then, squeezed light is interfered on a 50/50 optical beam splitter to restore the entangled light. The quantum entangled beams of subharmonic waves with anti-correlated amplitude-quadratures and correlated phase-quadratures are experimentally generated from a resonating frequency-doubler pumped by a subharmonic laser through a type-Ⅱ phase matching frequency-conversion. Noise power spectra of the amplitude sum and the phase difference between the entangled beams are 0.2±0.1 dB and 1±0.2 dB below the shot noise levels, respectively. Finally, the unequal entanglement rate of two quadrature is analyzed. Compared with the authors' frequently used method of generating entangled light——the optical parametric oscillator, the configuration of authors' system is relatively simple.