目的 通过建立一套印前控制与网点补偿的规范操作流程来减少单张纸胶印机在印刷时容易产生周向墨色不匀的现象。方法 首先设计可测试印刷机周向墨色均匀性的测试文件，然后测量样张的周向密度，并绘制密度分布曲线，利用密度分布进行数据拟合来确定网点补偿量的大小;最后在分色制版阶段利用补偿公式对网点进行补偿。结果 通过该方法得到网点周向的最大密度值和最小密度值之间的误差约为0.45，有效地控制了周向墨色的不匀性问题。结论 实验证明了采用文件预处理的网点补偿方法进行墨色补偿方案能有效控制印刷过程中油墨的转移，且补偿后的测试文件可用来记录设备的周向墨色不匀性特征。

The work aims to establish a set of standard operation process of prepress control and dot compensation to reduce the phenomenon of circumferential ink unevenness in sheet-fed offset press. Firstly, a test file that could test the circumferential ink unevenness of the press was designed. Then, the circumferential density of the sheet-fed was measured, the density distribution curve was prepared, and the density distribution was adopted to fit the data to determine the amount of dot compensation. Finally, in the stage of color separation and plate making, the compensation formula was used to compensate the dot, so as to control the circumferential ink unevenness of offset press. The error between the maximum density and the minimum density in the circumferential direction of the dot obtained by this method was about 0.45, which effectively controlled the unevenness of the circumferential ink color. The experiment proves that the ink color compensation scheme by the dot compensation method of file preprocessing can effectively control the ink transfer in the printing process, and the compensated test file can be used to record the circumferential ink color unevenness characteristics of the equipment.