Abstract: A simulation experiment system of mine water inrush was built, and variation characteristics of electromagnetic radiation, acoustic emission and surface electric potential signals were researched during mine water inrushing process. The research results show that variation trend of the three signals is generally described as a stable initial stage, a fluctuant middle stage and a fast-descending ending stage during mine water inrushing process. The three signals has positive correlation with rupture of floor strata, so as to illustrate rupture situation inside coal rock during mine water inrushing process. Fast increasing trend of these signals can be regarded as a forecast of rock rupture, while sudden drop after a significant rise of the electromagnetic radiation signal can be a harbinger of water inrush.