AIN powder was treated by shock waves with pressure of 9.8GPa. X--ray line broadening effect was found as the result of strain stored in shocked AlN lattice. Estimated value of the strain is 2.85×10-3, related dislocation density in shocked AlN powder is in the order of 1011/cm2, the energy stored in shocked powder is 0.36Caf/g. The low temperature pressureless sintering processand thermal conductivity of shocked AlN powder with 6wt% additives were investigated. The results showed that, the dislocation in shocked AlN powder can promote low temperature sinetring.In addition, it can remove A12O3 from AlN lattices and achieve high thermal conductivity. The energy stored in the shocked powder was released during the sintering process. The temperature of maximum shrink rate of shocked sample was about 25'C lower than that of unshocked one. The density of the shocked sample sintered at 1610℃ for 4h was 98% of its theoretical value, compared with 80% of the unshocked one. The dislocation in shocked AlN powder can provide paths for the diffusion of oxygen through the grain in sintering process. So besides di ssolution-reprecipitation,dislocation-- enhanced diffusion contributes its efforts to sintering, and it is beneficial for both sintering and achieving high thermal conductivity. The dislocation then can recover in the laterstage of the sintering process.