An orange-red laser was designed and developed based on a composite cavity structure with tunable wavelength, W-level continuous output. It consisted of a resonant cavity which generated p-polarized 1 062.9 nm fundamental frequency light based on laser diode side pumped Nd∶GdVO4 crystal and a single resonant optical parametric oscillator using a periodically poled crystal MgO∶PPLN with three-poling periods (29.0 μm, 29.8 μm, and 30.8 μm). In the overlap region of the two resonant cavities, the type-II critical phase-matched crystal KTP was used to bring about inner-cavity sum-frequency generation with the s-polarized signal light and the p-polarized 1 062.9 nm fundamental frequency light. By the tuning of three different polarizations of MgO∶PPLN crystal and the temperature tuning in the range of 30℃~200℃, the wavelength tunable orange-red laser with W-level continuous outputs in three bands(613.4~619.2 nm at 29.0 μm, 620.2~628.9 nm at 29.8 μm and 634.4~649.1 nm at 30.8 μm) were obtained. In addition, the wavelength tunable mid-infrared idlers were gained in the corresponding bands(3 980.0~3 758.5 nm at 29.0 μm, 3 714.2~3 438.3 nm at 29.8 μm and 3 278.0~2 940.2 nm at 30.8 μm). By changing the poling periods at 30℃ minimum temperature, the maximum continuous output powers were measured as 1.52 W (at 613.4 nm), 2.21 W (at 620.2 nm) and 3.03 W (at 634.4 nm). At the same time, the maximum continuous output powers of the three corresponding idlers were measured as 2.36 W(at 3 980.0 nm), 3.17 W(at 3 714.2 nm) and 4.13 W(at 3 278.0 nm), respectively.