With the experience of field mapping practice during the last decade, a simple conclusion of four-level-field-management strategy was summarized. Level 1 was to describe the spatio-temporal variability of the fields, such as soil mapping and yield/quality mapping, and then to recognize the evidence in the field. Level 2 was to understand why the variability came out with help of farmers’ experience, such as mushing up of the date, memorizing the work history and the environmental conditions. Level 3 was to make decisions in order to increase the throughputs in long-term implication, looking at increases in the yield/quality under regional constraints and reducing the cost, or change the cropping system. Level 4 was the action and evaluation, such as to choose actions under the constraints of such labors and machinery. Research actions corresponding to the levels are different each other.