This paper deals with eight questions about remote sensing technique used at geologycal work. They are how to understand the function of remote sensing that used at geological work,remote sensing image interpretation and ioformation extraction, the circular structure, the image variation, the interpretation extent of geological they, the image anomaly, the perspective information and the image models of remote sensing geology. Basides, this paper preliminary analysis the studying present condition and direction about aforesaid and provides the autoer's preliminary apinion.

In remote sensing image interpretation, different grades of linear structure, different types of circular structure, different combinations of linear and circular structure, and color anomaly are the most useful ioformetion for porphyry copper.1. The Scale of Porphyry Copper Connect Directly with Different Grades of Linear Structure Regional porphyry copper zones are controlled directly by large regional linear structure zones and their convergent patters. The regional linear structure zones which show light color zones in image usually are regional compression crustal or over-crustal faults, over 100km in length,called peripheral-major linear structure zones. In addition, a lot of secondary linear structures which intersect with the peripheral-major structures in suitable angle, form joining-up structures, of ten also show light color in image, directly control ore field distribution and deposit location. They are called crosswise linear structure, generally from 1 to 100km in length, mainly include 3 types and show tension characteristics. In fact, more lower grade of linear structures (faultsand fractures) which usually form circle, radiate like fault and fracture system, directly control alteration and mineralization related to the perphyry copper.2. Different Assemblages of Multilayer Circular Image Feature Reflect on Different Circular Structure Blocks Contained Porphyry Copper Almost all porphyry coppers relate to circular blocks, especially to Ⅲ or Ⅳ grade circular structure blocks (D. From 50 to 500km), including upwarped circular blocks, downwarped circular blocks and foldcircular blocks, fault circular blocks etc.. They control the location of porphyry copper. In igneous circular blocks, coppers usually lie in: (1) On the demarcation surface or the center of multilayer circles reflected on batholith and small hidden rock body; (2) Inside or on the edge of multilayer circles reflected on crater and crypto-explosive breccia pipe; (3) In alteration zone, the circular features show the volcanic rock, intrusive rock body, volcanic apparatus and alteration envelope.3. Linear-Circular Structures Jointly Control the Distribution of Deposit or Field of Porphyry Copper The position of linear structure intersecting or contacting with circular block structtire generally indicates the canal of ore fluid and the space of ore capacity, as a result, it control the distribution of deposit or field of porphyry copper. They mainly include: (1) The action that multilayer inter-contacting circles intersect with linear structure; (2) The out -circle section of multilayer concentric circles, haled in the angle area intersected by two groupo of linear structures;(3) The demarcation surface or the center of multi- layer near concentric circlar block, located in the area intersected by two groups of linear structures; (4) In the big circle with small intercontacling circles, two groups of linear structures intersect, a series of more small circles separately appear along the two groups of linear structures in string or belt, the deposit appears in the edges of the more small circles; (5) Two groups of linear structures intersect in double concentic circles, pluy porrphyry copper appears in the edge of small inter circle.4. The boor Anomaly of Circle and Circular Belt Present Alteration Related tO the Mineralization of Porphyry Copper TM and MSS images processed by computer can clearly show the abnormal color circular belt caused by alteration related to porphyry copper. For example, in TM [6/7 (red), 6/5 (green),6/4 (blue)] image of Wunugetushan quartz-sericitization allerations in which deposit is formed present which circular belt, and illite hydromica alterations in light cyan is outer-circular belt,aroud the which one.

Liuzhi-Langdai region is rich in mineral resources but being complex in geology and structural deformation patterns. In this paper, the author applied a new method of recovering local structural deformation field and tectonic stress field---"Remote Sensing Image AnalysingMethod" which was advanced by the author, major structures and transverse tensional joints related to the major structures in the region were systematically interpreted. According to the new method, local structural deformation field was established and the tectonic stress field was recovered. On the basis of geological analysis, conditions controlling ore deposits was discussed.

Acording the demand of Saute Planning Commission and Ministry of Geology and Mineral Resources, the evaluation and selection of ragional geochemical anomalies of the city of Hunjian sheet in Jilin province has performed using geologic remote sensing method, mainly by airphoto and satelite photo interpretation combining geology, mineral resources, geophysical and geochemical materials integration. Geological characteristics of gold and multimetal mineralization are expounded. The relationship of fault structure, circle structure and gold, multimetal ores as well as geochemical anomalies is discussed. The results of the evaluation and selection of regional geochemical anomalies and field verification as well as ore-search target locating are briefly presented.

Remote sensing in combination with ground gravity is one of important means for spatial geological study. In this paper the substrate framework of Xiangshan orefield has been defined and the structural evolution and its uranium metallogenesis controlling is farther discussed using four types of remote sensing information, namely belt, line, circle and block by comparison with groud gravitational gradient zone, gravitational anomaly and substrate rilief respectively.

In this paper the image characteristics of petrographical factes of contiental red beds, sedimentary system bourdary, basin fill sequence, prtrographical face variation, stratigraphic framework, etc., are studied and recognized by geological remote sensing technique. The results are remarkable and a new approach is developed for 1: 50000 geological mapping in continental red bed basin.

The evaluation of engineering geological environment along Shenzen-Dayawan coastal highway was quicly completed by Landsat TM digital image interpretation for geo-science ioformation study using computer information enhance and extracting techniques combining aerial photo stereoscopy and field investigating and verifying. TM theme ioformation image processed by computer using different methods has played an important part in geological structure interpretation and rock and soil mass classify. Aerial photo is usfull in geological body boundary demarcating and geological hazard phenomenon analysis. The complete work including image processing and interpretation, field check and mapping as well as report compiling had accomplished in less than two months. It is saving exploration fund more than 50%, meeting the requirement of earlier stage before road exploration, and fully reflecting the advantage of remote sensing technology. Remote sensing combining conventional method of geological field check and mapping is a state-of-the-art toal for road exploration and can get twice the result with half the effort.

Based on the data of wave spectrum of coal fire area, this article discussed the following items about application of TM images to detecting coal fires. 1). The best choice of temporal and the best compose of band of TM images in studying coal fires. 2).Interpretation marks and image characteristics of coal fire on the TM images. 3). Using different temporal TM images to forecast and detect coal fire dynamicly in Baishan Qitai, Xinjiang.The result of studying provided reliable basis for extinquishing coal fire and engineering management.