By introducing two common cleaning processes and technology for long distance pipelines,this paper puts forward the merits and demerits of the technology in rock salt mine to the colleagues for reference.

This paper introduces the theory of scale removing process with chemica l cleaning and its application and practice in brine wells and pipes in rock sal t mines,proposing to popularize and apply it in rock salt mines so as to improve technological progress and economic effects of the whole industry.

This paper introduces the technological characteristics of casing mending and patching technology and analyzes casing accidents in brine well of rock salt mines.

Through analysis on wide application of horizontally butted well in exploiting rock salt deposit and in combination with current situation and existing problems in rock salt mine exploiting in Penglai,this paper forecasts the application prospect of horizontally butted well in exploitation in the future.

According to the requirement of stability analysis for karst cavity and in-situ stress analysis,conditions of drilling-dissolving mining for deep rock salt mine,and practical experience of research on in-situ stress measurement in deep rock salt mine,the selection principle of measurement methods,measured points and samples are determined.

Taking the environmental effects of gypsum mine and salt mine for example, this research indicates that the damage caused by gypsum mine and salt mine include not only the pollution caused by inorganic salt but also the descent of ground.

Gray Relevancy Theory applied in assessment of rock body quality of mine;