Abstract: Through market demand research, developed a super creeper and reverse shift gear box in tractor.The gear box structure adopts fixed-shaft cylindrical gear external meshing four-step reduction transmission scheme, high structural strength, simple process, large reduction ratio, super creeper.The gear box is used in one type high-horsepower tractor, which better meets the special operation requirements of ultra-low speed which using the creeper in Hebei, Henan and Shandong provinces, and has remarkable economic benefits.