In April 2014, China's vehicle diesel engine production and sales completed 339,960 units and 351,752 units respectively. Due to the bleak production and sales situation in April, the cumulative growth of production and sales in January-April decreased significantly. In April, the market situation of single-vehicle diesel engines in the month was stable, and the supply and demand market continued to balance. In 2014, the domestic diesel engine market was adjusted in a reasonable direction, which also showed that the development trend of the commercial vehicle market tends to be moderate. From the production of diesel engines in April 2014: Weichai, Yuchai, China FAW, Quanchai, Jiangling Holdings, Yunnei Power, Dongfeng Motor, Beiqi Foton, Shandong Huayuan Laidong, Chaochai ranked before the diesel engine production enterprises Ten places, the output was 52,297 units, 49,700 units, 44,915 units, 36,129 units, 24,255 units, 19,706 units, 18,978 units, 15,481 units, 15,238 units, and 11,535 units, respectively accounting for 15.38%, 14.62%, and 13.21% of total diesel engine production. %, 10.63%, 7.13%, 5.80%, 5.58%, 4.55%, 4.48%, 3.39%. The above-mentioned ten enterprises produced a total of 288,234 diesel engines, accounting for 84.78% of the total diesel engine production. From the sales of diesel engines in April 2014: Yuchai, Weichai, China FAW, Quanchai, Jiangling Holdings, Yunnei Power, Dongfeng Motor, Beiqi Foton, Shandong Huayuan Laidong and Chaochai respectively ranked in diesel engine sales. The top ten sales volume was 60,633 units, 52,125 units, 44,622 units, 37,459 units, 24,292 units, 20,181 units, 19,533 units, 15,590 units, 14,166 units and 11,688 units, respectively accounting for 17.24% and 14.82% of the total sales volume of diesel engines. 12.69%, 10.65%, 6.91%, 5.74%, 5.55%, 4.43%, 4.03%, 3.32%. The above ten companies sold a total of 300,289 diesel engines, accounting for 85.37% of the total sales of diesel engines.