With the three basic methods of heat transfer (heat radiation,residual gas conduction and solid contact conduction),the performance of the normal heat transfer in multilayer insulation has been studied and discussed in detail.

The failure mechanism of multilayer insulation (MLI) in low-altitude environment and its protection;

It can been seen from the calculation result that the multilayer insulation has good heat insulation effectiveness because there is a temperature difference of 130K between its outest layer and its innerest layer.

On the basis of an analysis of the in-orbit temperature data of CBERS multilayer insulator(MLI) outer surface film, the temperature change rule along with orbit heat flux was found in this satellite orbit.

In order to improve the performance of traditional temperature-resistant insulation materials,a newtype high-temperature multilayer insulation(MLI) material was developed by felting process using alumina silicate fiberpapers and silica fiber net as substrate,and hydrophobic silica aerogel granules as fillings.