Abstract: The co-cracking of natural gas and coal by a 15kW nitrogen(N₂ flux:2m³•h^-1) thermal plasma jet was investigated experimentally.For comparing with the cracking natural gas or coal separately, the experiments were arranged as following: （1）Cracking of natural gas;（2）Cracking of coal;（3）Co-cracking of natural gas and coal.Under the same experimental conditions, especially the same power, the experiments show that co-cracking can lead to more output of acetylene and ethylene, even more than the sum of that from（1）and（2）.The analysis shows that,during the co-cracking process, the natural gas and the coal both acquire the effect of cracking separately; the surplus output may probably be resulted from the interaction of hydrogen and carbon. Here, the hydrogen is resulted from cracking of natural gas and the carbon——from cracking of coal.