中文摘要：

利用购自吉林省测绘局的4个国家三角点的西安80坐标，配合手持式GPS（奇遇eTrex Venture）实地测得的对应WGS-84坐标，应用五参数法解算出龙井市城区及周边WGS-84坐标转换为西安80坐标的转换参数．将其输入手持式GPS接收机，对龙井市区范围内的部分控制点进行实地验证，最大误差4．2m，最小误差0．7m，符合手持式GPS单点定位精度要求．

英文摘要：

The coordinate system used by GPS handset is WGS-84, whereas the coordinate system commonly used in China are Beijing -54 and Xi＇an-80. In order to use GPS handset to measure Xi＇an coordinates of Longjing City, Jilin province, the article combines four national triangle points bought from Bureau of Surveying and Mapping of Jilin Province with the corresponding WGS-84 coordinates measured by GPS handset on the spot, then uses the Five-Parameter Method to calculate the parameters for the transformation from WGS-84 to Xi＇an-80, which can be applied in Longjing City and adjacent area. It＇s proved by the field survey that the maximum error is 4.2 m, and the minimum error is 0.7 m, both of which satisfy the precision requirement for single point orientation with GPS handset.