Abstract: Based on high resolution images, the percentage sampling method was applied to study the survey approach and monitoring techniques for afforestation investigation in the urban and plain area. A suit of complete technological process was proposed after having solved the difficult technical problems such as boundary determination, sample plots setting, RS image interpretation, on the spot verification, precision analysis, etc.. The quantity of plots to be sampled that directly affect the workload was discussed. The results obtained from the practical application showed that the survey data were abundant with high accuracy guarantee. The problems including commanding height selection, comprehensive analysis of survey data and the reliability of the investigation results could be well solved by using this technology when conducting afforestation investigation in the urban and plain areas.