Plasma convergence time of half-hohlraum target with single-end drive by 8 bundled lasers are researched on SG-III prototype laser facility. Four radiation sources were established by changing the structure of target bottom. The relation between plasma radial convergence time obtained by x-ray framing camera and radiation temperature from soft x-ray spectrometer have been investigated. The results showed that plasma radial convergence time is directly proportional to radiation temperatures on different structures of target bottom, which lengthens as radiation temperature increases.