Comparison is made on the determination method of allowed bed bearing between geological reports of China and abroad． Analysis is made in this paper to determine the correction factor of bed bearing capacity．

Investigation progress of magnesium oxychloride cement (MOC) was summarized in this paper． The excellent performance, the defect and phase change mechanism of MOC were introduce by the author． The modified method and application of the product were reviewed． 

In order to make accurate inspection on poisonous and contaminating elements during wastes treatment, atomic absorption spectrometry (AAS) is used to determine the content of heavy metal elements． This paper discussed four factors which influencing the accuracy analysis of AAS results: operation parameter, zero point, standard curve and disturb substance． Through national setting of four factors, the accuracy of determination is improved, thus the basis of wastes treatment is provided．

The energy－saving measures of cement factory air compressors are introduced including energy－saving runing administer, reactive－load compensation, frequency conversion velocity regulation some energy－saving methods so as to supply reference for cement factory air compressors safely, efficently, reliably running． 

For higher energy utilization and to realize economy energy consumption in China cement industry, waste heat generation of PC kiln has been given increasing attention and has entered into fast development． At present, many cement plants attempt to take waste heat generation as their competitive superiority． Based on thermal detection of Chaohu Rail 1500t／d procalcining line, the related equipment and parameters are analyzed in this paper． In addition, the prospect of waste heat generation is forecast．

Wet gunning material (shotcreting technology) for different kiln zone is introduced by the author． Shotcreting machine, job practice and utilization effect is shown here． Compare with traditional castables, the utilization of gunning material can shorten construction period and save construction cost．