The Baikal Group is one of the most important stratigraphic units in the geology of East Siberia ( Upper Riphean) ． This paper focuses on litological-facies features based on the analysis of organic remains ( stromatolites， microphitolites and microfossils) ，in order to better precise the age and environmental deposit conditions of the Baikal Group． The results are used to draw a correlation between all the Precambrian of deposits of the South of East Siberia． The stratigraphy of the Baikal Group is then compared to the geodynamic evolution of this region，characterized by the break-up of the supercontinent Rodinia and subsequent opening of the Paleo-Asian Ocean． Stratigraphic analogs to the Baikal Group display in most areas deposits of various minerals ( complex ores，phosphoresces，bauxites etc． have been dated of the same age) ，so the present study would also provides an economic interest．

In the southeast part of the North-Asian craton，several ring basite-ultrabasite plutons have been recognized， with which the commercial placers of platinoids associate． Analysis of the known geodynamic models of the region formation and materials of seismic tomography showed that the subduction processes，that actively manifested themselves in the Asia-Pacific convergence zone in Mesozoic，were responsible for initiation of the stagnated oceanic slab． Its NE and SW boundaries appear to coincide with the transform faults． Projection of the transform fault，bordering the above mentioned slab in the NEN，coincides with the Konder-Feklistovsky metallogenic belt distinguished earlier and its Aldan ( Inaglinsky) member． Higher platinum content of ring massifs of the belt is controlled by the influence of the lower mantle derivatives on the ascending upper mantle plumes．

Based on China National Standard of Soil Engineering Classification ( GB/T 50145-2007) and the Unified Soil Classification System of American Society for Testing Materials ( ASTM D-2478) ，two kinds of soil laboratory engineering classification methods were discussed and analyzed from the aspects of the definition in particle fraction，classification of soil type and evaluation standard for soil gradation． There is a same limit of fine grains fraction in the two standards，and there are three main types of soil in GB/T 50145-2007 and two in ASTM D-2487． Different evaluation standards of gradation are put forward for gravels and sands in ASTM D- 2487． Same criteria of A line，B line and controlling value of plastic index are in the plasticity chart of both standards．

Based on the process of reinforcing soft soil using cement in laboratory，the porosity of test samples under different pressures conditions were determined through mercury intrusion porosimetry． The experiment was introduced and the law of porosity variation was summarized． The results show that when stress is between 0 and 0. 15--0. 2 qu ，porosity decreases along with the pressure，then porosity has increased in the wake of the pressure until the sample damaged． It can provide an experimental basis for exploring the failure mechanism of cement stabilized soil from the microscopic view and the study to establish the microcosmic constitutive model of cement stabilized soil．

According to the data of preliminary survey，the authors established a landslide geological model， on the basis of analyses on the sensitivity of landslide，tried to simulate and calculate the landslide stability of Shuitianba with the method of transfer coefficient when it is under different strength parameters，and study the landslide mechanism． The results show that it is sensitive to the effects of shear strength parameters of sliding zone and groundwater level on landslide stability safety coefficient，which provides reliable basis for calculation of landslide stability．

There exists synchronous growth in resources consumption and environment pollution in Kunming urbanization in recent years，which has led to the increasing pressure of urban sustainable development． Considering the environmental and social benefits in Kunming's water resources sustainable development，the authors provided a research finding the optimal urban population scale in different stages for urban water supply based on the sustainable development groundwater evaluating theoretical model． Through the research on the availability of construction site as well as the risk in underground space exploitation with the extenics theory method，we get a suitable partition map of land for urban construction and a risky partition map of underground space development． The results show that the appropriate population scale of Kunming will be less than 2. 96 × 106 by 2020，and will reach ( 4. 34--2. 96) × 106 optimized population scale after 2020 under the condition of economic- socially and environmentally sustainable development． It is significant to optimize urban construction land and use underground space under the condition of land resources sustainability in Kunming．

In order to evaluate the danger of debris flow properly，eight factors were selected as the risk assessment indexes of the debris flow，namely the vertical slope，valley relative difference，hillside slope，area of basin， loose solid material reserves，the path length of sediment supply probability，silting and scouring derricking and vegetation coverage． The improved Analytic Hierarchy Process ( AHP) method was used to obtain the weights of the factors; and the efficacy coefficient method was adopted to evaluate the risks of six typical debris flow gullies． According to the research，the improved AHP method not only avoids the subjectivity in the individual factor valuation by comparing two factors of each layer，but also makes the subsequent consistency check unnecessary．

In order to study the law of mining subsidence and ground movement，to provide the basis of coal mining under building，railway and water，we used the probability integration method to make comprehensive evaluation of ground stability． Take Yingcheng Coal Mine of Jiutai as an example． Mining-induced movement and horizontal movement are analyzed on the basis of the measurement data． The results of prediction can provide reference and basis for prevention of coal mining subsidence and future restoration and treatment．

Bionics was applied in the design of the impregnated diamond bit． Based on previous research and the 63# bit matrix formula，a new non-smooth bionic impregnated diamond bit with a single circular ring was designed and manufactured，and also tested indoor． The results were satisfactory． During its shape contacted surface system，non-smooth shape display some structure merits such as decreasing resistance． It was obvious that the drilling efficiency of the bionics bit is much higher than that of ordinary's one，and so does the working life of bionic bit．

Heating the oil shale by current underground to accomplish in-situ transformation process，is a viable direction． The electrical properties of oil shale under different temperatures，especially the resistance，become important． Charging oil shale underground to heat oil shale till kerogen's decomposition temperature，then crude oil and other gases can be generated． The resistance of the oil shale samples was measured by Direct Current ( DC) quadripole method to find out the variation rules of resistance value． In the experiments，oil shale presented its semiconductor property． When heated till 350℃-450℃，its resistance changed greatly，optional for heating and cracking． The porosity，oil content，media and composition affected the resistance largely．

permeability，and reservoir pollution is a common phenomenon in this area． Acidizing deplugging in oil wells has become one of the major measures to improve production efficiency in the field． A compound deplugging technology in high efficiency low corrosion is developed for this kind of low permeability sandstone reservoir． On the basis of profoundly understanding of the reservoir's physical properties and sensitivity，along with comprehensive analysis of the cause for jams in oil wells，a series of experiments are carried out in order to investigate the dissolution reaction among samples and deplugging inhibitor，sample dissolving speed，formation fluid compatibility，reduction of secondary pollution，etc． Considered reservoir condition in nearby wells the optimized compositional deplugging liquid formula is selected for this reservoir． It is featured by reducing the deplugging reaction speed，extending solution for processing radius，preventing secondary damage in dissolution processing，and removing plug pollution effectively． To implement this high efficiency low corrosion deplugging measure based on reservoir condition in the borehole and nearby wells，a relatively better result of deplugging and production increasing is achieved，which enriches the measures to increase production in Xinmu oilfield， and this method can be applied to other similar oilfields for the purpose of maintaining the crude oil production and providing assistant for increasing the production significantly．