A fast gelling process to synthesize kalsilite powder was performed by dropping aqua ammonia into the TEOS-KNO3-Al(NO3)3-EtOH-H2O system, which resulted in the formation of a gel in 5～12 minutes. Compared with the traditional sol-gel method, the gelation time is greatly shortened. The optimum gelling conditions are as follows: molar ratio of H2O to TEOS25, molar ratio of EtOH to TEOS4 and pH value about 9. Kalsilite powder is produced by treating the dried gel under 862℃ for 3 hours. The synthesized kalsilite particle is nearly 50 nm, and most of the secondary particles 5～20 μm. The specific surface area of synthesized kalsilite is 26.3 m2/g with an average intergranular pore size around 11.2 nm. The synthesized kalsilite powder is mesoporous with a bimodal pore distribution. Pure and homogeneous, stable in high temperature and with high potassium content and a bimodal pore distribution, the synthesized kalsilite powder can serve well as an efficient catalyst aid with relatively high application value.