Preface According to the requirements of Document JB[1997]No.108-Ministry of Construction,"Notice of Printing and Distributing for the1997 Preparation and Revision Plan of Engineering Construction Standards'"that the"Load Code for the Design of Building Structures"GB]987,which was ap- proved by 1987 the State Capital Construction Commission of the Peoples Republic of China,has been revised by the China Academy of Building Research together with the relevant units. In the period of revision,the code revision group carried out various studies on specific topics, smmarized the recent domestic design experience and referred to the concemed contents of aboad codes and intemational standards,meanwhile,the various ways were used by the code revision group tosolicit widespread relevant units,the code was bom out through repeated revisions and finally,the new version of code was decided after examination. The cde includes7 chapters and 7 appendices,the main revised neinpresent codereas follows: 1.Based on the revised combination rule in the revised edition of "Unified Standard for Reliability Design of Building Structures"and cast away the od ideasfor"combination of wind od" the combinations,which are controlled by the permanent load effects,have been added into the funda- mental combinations of loads;in the serviceability limit states design,two types of combinations in- cluding the characteristic combination and the frequent combination are given in the combinations of short term effects,in the mean time,the coefficients for frequent values for variable loads are in- creased;the respective coefficients of combinations values are given in the all combination values of variable loads. 2.Partial adjusted and supplemented to live loads 3.For uniform live loads on roofs,the live load on unmanned roof is adjusted and the stipulations for the loads of roof garden,helicopter parking apron are added 4.The character of service for crane is changed to the working grade of crane 5.Wind pressure and snow pressure have been considered anew respectively by their statistical data,according to the new from ntion-wide observatory,mean- whil,the mean recurrence interval for the reference values of wind load,snow load have been changed from a30-year mean recurence interval to a50-year mean recurrence interal;the values of ow pressure and wind pressure from the main meteorological stations throughout the counry,during a 10-year,a50-year and a 100-year mean recurence intervals respectively are given in the appendix of the code. 6.A category of terrain roughness is added. 7.The adjustment the topographic conditions have been given to the expo sure factors of wind pressure for the buildings in mountain area. 8.A special stipulation for the wind oad on the fencing structure is given. 9.The consideration for the influences of interference with each other between buildings in a ar-