Abstract: Data processing use C4.5 algorithm with Excel is useful to speed up manual calculations. Use of MS. Excel to help users to learn in understanding data mining algorithms before using programming languages like Java, C ++, R programming, etc. Data train is the data recruitment assistant laboratory. This data has several stages: file collection interview, written test, coding test internship test, teaching test, a coding test for 12 h. Based on the phase stage will be done with the calculation C4.5 algorithm. Based on the results of this experiment will form a decision tree.