In order to manage and operate the high-power agricultural machinery scientifically and properly and improve the work efficiency of the tractor-implement units, the authors analyze the time utilization and work efficiency of tested tractor-implement units based on surveying and testing sowing and harvesting of wheat. The results show that the main factors which influence the time utilization and total work efficiency of sowing and harvesting of wheat are to add seed and fertilizer, to eliminate trouble and field turning, and there exists unreasonable power matching for some tractor-implement units. According to the survey results, the authors bring up the proper pattern for reasonable application of high-power agricultural machinery.