Aimed at the failure mode for heavy-duty diesel engine driving gear, the calculation and analysis of bend strength, contact fatigue strength for the oil-pump driving gear was conducted. A new P/M warm compaction material of high wear-resistant was developed and its friction and wear test was also performed. Its wear-resistance increased apparently in comparison with the alloy steel material of 38CrMoAl; The method of P/M die with warm compaction die wall lubrication was adopted to make oil pump driving gear, the distribution of density is uniform. The simulation result is consistent with the experimentation under the conditions of three-dimension finite analysis of gear with big strain and stress. Furthermore, manufacture cost, machine processing and materials using rate between metallurgy warm compaction gear and alloy gear were compared, the total cost of warm compaction gear has been reduced about 35% compared with the alloy gear. At last, the experiments on break of the teeth, reliability of the oil pump and durability of the gear were also carried out. And the results show that during the life-span of engine, the driving gear of powder metallurgy warm compaction is very wear-proof and of the great strength. The gear meets the requirements of the heavy-duty diesel engine.