During the last 20 years，The company has established a long-term friendly cooperative relationship with a dozen large and medium-sized enterprises which have more than 10 billion investment,such as Henan Jianghe,Zhumadian Baiyun,Xinxiang Xinya,Jiaozuo Ruifeng etc.Since 90s of the last century，Chengzhi started to serve these enterprises，The company re-updated the original products、control mode and production，base on the good quality of products serving these enterprise for more than 20 years.