The Z-pinch dynamic hohlraum (ZPDH), as implemented on qiangguang-1 facility at NINT, is composed of an annular tungsten plasma that implodes onto a coaxial foam convertor. The collision between tungsten Z pinch and foam convertor launches a strong shock. The shock generates a strong radiation pulse, referred as the first radiation power peak, then the radiation is trapped by the tungsten Z pinch. As pinch diameter decreases, the second radiation power pulse rises and acts as the main power peak. The radiation and dynamic characteristics do not show obvious difference between the 8 mm and 12 mm wire array configurations. Hence, it is important to notice that the foam reduces the influence of global instability generated by MRT instability on stagnated pinch, especially reduces the growth of m=0 and m=1 MHD instability.