Currently, since most of mirrors for space optical cameras are made of brittle materials, they are suitable to be fixed by cementation with simple configuration. However, how to control cementation quality and how to reduce or remove the transmutation of the mirror due to the stress of cementation are very important. For the mirror optical epoxy glue cementation frequently used in space optical cameras, because the measures such as reasonable determination of cementation parameters, control of cementation thickness and use of proper optical epoxy glue technology are taken, the stress due to the cementation of the mirror is reduced and the surface figure of the mirror is kept unchanged before and after cementation. The test result shows that this cementation method is reasonable and feasible.