CO₂ outburst is a main geological disaster in coalmines. A survey of study on CO₂  outbursts at home and abroad and the latest developments in research of China are introduced in this paper.
    The CO₂  outburst in the Lower Silesia Coalmine in Poland is the most serious in the world. In China，the extraordinary outburst of CO₂ gas happened on  May 24，1978 in the Yaojie Coalmine，GansuProvince. In the recearch work of Yaojie,we launched study on some forward domains. Such as helium and argon isotopes , fission一track dating of calcite veins，thermal simulated experiment and so on , and got some new data and new results.