Based on a typical multilayer insulating materials in vacuum environment of series experiment and anlytical
heat insulation performance,trend of multilayer insulation material layer temperature difference (Δt ) distribution
was anlytical and the multilayer insulation materials in different interlayer insulation performance characteristics
and their variation regularities was disdesed. The test results proved that multilayer insulation performance is superier
to the intermediate layer heat insulation performance. Inside 4 layers and outside 18 layers air flow approach the molecular
flow with better thermal insulating performance and big temperature difference(Δt ). The middle layer air flow
is unsteady,and the insulation performance slightly differenct,temperature difference(Δt ) near the heating plate side
is smaller, interpass temperature is less than the low temperature side.