Abstract: In order to meet the needs of the coal rapid filling and sealing, a new type of inorganic foam filling material with the relevant equipment and techniques are developed. The initial set time of the material is from 2 to 30 min; when bubbling times are over ten times, its compressive strength attains over 1.7 MPa after 24 h reaction. On site industrial test shows the excellence of the inorganic foam filling material and technology, including fast filling, airtightness, low cost, high automation, and economical.