Soda　residue　was　used　for　preparing　baking-free　brick　which　originated　from　producing　soda　ash　by　ammonia-soda　process.　The　effect　of　soda　residue,　fly　ash,　slag　and　powder　with　different　contents　on　the　strength　of　the　baking-free　brick　was　studied　and　the　optimal　admixture　ratio　was　determined.　The　results　showed　that,　7　d　and　28　d　strength　of　the　prepared　baking-free　brick　could　reach　14.0　MPa　and　20.6　MPa,　respectively,　with　a　water　absorption　of　13.4%,　when　the　mass　ratio　of　soda　residue,　fly　ash,　slag　and　powder　was　4:3:2:1.　The　results　of　SEM　showed　that,　even　granules,　showed　well　interface　bonding　and　dense　brick.The　results　of　XRD　represented　the　main　minerals　of　baking-free　brick　were　CaCO3,　Ca2SiO3Cl2,　Ca3Si6O12(OH)6·5H2O.　Therefore,　the　soda　residue　can　be　used　for　preparation　of　baking-free　brick,　with　simple　machining　technology　and　low　cost.　©　2016,　Science　Press.　All　right　reserved.