Abstract: Adopted the method of orthogonal test, the manufacture process and technology of a new-type insulation mortar which is used the brucite fiber as a reinforcing material are discussed. The research indicates that fiber types have greater impact on mortar compressive strength, flexural strength and density, perlite dosage is the biggest influence on mortar thermal conductivity, and the fiber content is the main factor affecting the linear shrinkage rate. The appropriate mix of the brucite fiber insulation mortar: perlite-to-cement ratio is 1.1, X-type fiber, and the fiber content of cement volume is 4%. In the research of the three types brucite fiber, X fiber is most favorable to mortar strength, the corresponding mortar fluidity is great, bulk density is also bigger and the linear shrinkage rate is minimum. With the fiber dosage increase, the strength and thermal conductivity increase, dry density first increases and then decreases, linear shrinkage first decreases and then increases. With the perlite dosage increase, the strength and thermal conductivity decrease, linear shrinkage increases, dry density first decreases and then increases. Fiber length greatly influences on mortar performances: too long or too short fiber are not conducive to its reinforced role on mortar.