Abstract: in orderto studly fine cal separation regularity and detemine separatio linit of gas-solid aitated air dense medium fuidized bed ,the fuidization characteristics of gas-solid agitated air dense medium fluidized bed were analyzed.The results showed that air-solid agitateble separation with the agitation speed of 10 rf min.The ash content of 6 ～ 3 mm of fie coal decreased with the inreasing height ofuidized bed:which showed beter separation regularity and features according to densty of fine cal .T'he separation experiment of diffrent paricle sczes showedthat common fuidized bed coud separate 13 ~ i mm cea.the ash degree of segregaton was 1.56.whilegas-solid agiated air ense mediuom fuidized bed cauld separate 13 ~ 6 mm.6 ~ 5 m and 5～ 4 mm ceal.the ash degree of segregation were 1.74,1.36 and 1.35respectiv ly,The separation linit of gas-solid agiated air dense medum fuidized bed was 4 ～ 3 mm 3~1 mm fine coal could not be separated in gas-solid agitated air dense medium fluidized bed.