Abstract: In order to satisfy the demand of fruit integrative grading by appearance quality and weight, a weighing module for fruit integrative grader was designed. The theoretical calculation formula of fruit weight was educed with the method of force analysis, and the implementing method of fruit synchronous weighing process was presented. A functional relationship equation between the equivalent mass of the fruit (w) and the A/D conversion result was achieved and calibrated with apples, and it was testified with other apples. The experimental results showed that the weighing module could cooperate with fruit grader in inspecting appearance quality and weight of fruits, and the weighing precision was about 2%.