| Land is the basis of society and economy activity, and urban land is the main carrier of human life and society and economy activity. It is not only precious resource, but also important national asset and means of production. It has special significance in whole society economy. Urban land price has many functions in our county, such as publicizing, accounting, market reference, revenue, policy regulating, guiding use manners of urban land and income adjusting. Urban basic land price is the root of other land price, the core and foundation of land price system, the standard of governmental macroscopic supervision and control on land price, the reference of central government participating local land income allocation and the basis of assessment of land price. Establishing factor system of grade evaluation, analyzing the main factors and mutual quantitative relation affecting urban land price become the key of urban land price evaluation.This paper takes YIBIN city as an example, with 7679 samples collected, such technical route is adopted such as samples, collating, amending, sorting, bolting, spherical testing, principal component analysis, confidence level analysis and multiple regression analysis. We can gradually explain the main factors and their mutual quantitative relation which influences urban land price. The results of research reveals the variation disciplinarian and the affected factor, defines the factor limiting the urban regional development. All these offer scientific references for reasonable city planning, municipal building project planning, reasonable arrangement of land use, the confirmation of land use intensity and the improving land use benefit. And a series of methods we have explored can apply the practical manipulation of grading and assessing urban land, which contribute to enhance working efficiency, shorten the time of evaluation, enhance the updating of urban land price, establish a system of dynamic supervisory control and examination, and enhance accuracy and objectivity of urban land-rated evaluation. Therefore, the results possess active meaning in theory, academy and practice. The main research results of this paper are as followings:(1) Six land grades are classified. Based on the foundation of plenty datum, land revenue equation is gotten: Yn = 15.29 x (1 + 0.69)Xin.(2) Two models are adopted to calculate the urban basic land price in YIBIN City. To commercial use land and residential use land, the difference between the most two grades is biggest, and the others decline gradually. The difference between grades in residential use land is bigger than that of commercial use land, but litter than that of the industrial use land.(3)Through the fact-finding and experts consultation, the writer preliminary select eight factors and thirty-nine divisors which have an effect on land price in YIBIN City. As following is the effect of land price factors on urban land value: flourish degree > traffic condition >society server facilitiesmaturity> good or bad environment>good or bad nature environment>status of population > planning condition.(4) Analysis of item illustrate that, during the 19 influencing factors, the influences of post facilities maturity, atmosphere noise pollution condition, geologic and physiognomy condition, flood submerge condition and programming qualification have no difference in regions on business land price, the influence of green-belt park and geologic and physiognomy condition have no difference in regions on residence land price, the influence of rout net density and post facilities maturity have no difference in regions on industry land price.(5)According to result of analyzing factors of land price ,we found that there are obvious influence among these factors which affect the value of business land residence land and industrial land. Therefore, we can't simply assure that the relation between these factors and land value is not co-linearity.(6) The results of analyzing confidence level prove that the selecting samples used...
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