Abstract: Herein, we reportedthe design, analysis, construction and test of thedoughnut-shaped vacuum chamber, housing high-temperature plasma and dedicated to the magnetic confinement fusion reactor in the lab-built Keda Torus Experimental system (KTX) working in Reversed Field Pinch (RFP) fusion mode. The newly-designed vacuum chamber, 1. 4 m and 0. 4 m in diameter and cross-sectional radius, mainly included 12 pumping-ports/verticalsupports, two symmetrical hemi-torus chamber walls, and 35 different-sized feed-through/viewports. The thermal, electromagnetic and mechanical behavior under the operation conditions of the vacuum chamber were mathematically modeled, theoretically analyzed, numerically simulated and experimentally evaluated for design optimization and engineering commissioning. The preliminary results show that the torus vacuum chamber, at a base pressure of 1. 5 ×10^-6 Pa, meets quite well the stringent KTX requirements. We suggest the novel torus vacuum chamber, with easy spare-part replacement and maintenance, be of some technological interest in design of advanced magnetic confinement fusion reactors.