Abstract: There are nearly 50 years of history since the pillarless sublevel caving was introduced into our country，which occupies an important position in the iron ore mining with fruitful results in recent years.It gradually changes into a positive large structural parameters.With the improvement of environmental protection，rapid development of filling method，it is found that the pillarless sublevel caving method will still be the major mining method in the future after analyzing the features from aspects of the historical status，the economic development needs on iron ore，the occurrence of the ore body to be developed，and adaption from the open pit to underground.And the issues that should be paid attention under the development of large structural parameters are discussed from views of ancillary equipment，blasting，field ore-drawing theory.These are beneficial to improve the rapid development of large structural parameters，and give full play of the large structural parameters in the superior of pillarless sublevel caving method.

Key words: Pillarless sublevel caving, Structural parameters, Filling method, Charging trolley, Patio rig