Based on hydrothermal solidification, artificial aggregate was manufactured with solid waste such as silt, carbide slag and boron mud, which replaced part of natural aggregate in concrete. The micro-mechanism and the basic indexes of artificial aggregate were analyzed. Meanwhile, the influence mechanism of artificial aggregate on compressive strength and volume stability of concrete were discussed. The test results show that it is feasible to apply the artificial aggregate to concrete partly instead of natural aggregate. The compressive strength of artificial aggregate concrete with 25% replacement rate, 100% saturation and w/c=0.55/0.40 at 28d reached 32.0MPa/38.3MPa, respectively. Artificial aggregate is beneficial to improve the volume stability and promote the hydration process, and the 28d self-shrinkage with 100% replacement rate is reduced by 73.9% (w/c=0.40).