The domestic large and medium-sized petrochemical design institutes are mainly under Sinopec, PetroChina and China Chemical Engineering, which have been collated from their official websites, as follows: After the restructuring in 2017, PetroChina's petrochemical design institutes are mainly China Huanqiu Engineering Company Limited and China Kunlun Engineering Company Limited, with the pipeline bureau and the Petroleum Engineering and Construction Company (CPECC) in the upper and middle reaches of the business chain ( The engineering design company CPE has been subsumed under CPECC). Of these, Huan Globe Engineering in turn comprises the following units:

The petrochemical design institutes of CNPC are not very recognizable by their names alone, and some of them have changed their names several times since their establishment. After more than 60 years of development, its affiliation has been changed several times, and it has been renamed as Jilin Chemical Industry Company Design Institute, Northeast Branch of China Petroleum Group Engineering Design Company Limited (CPE) and Jilin Design Institute of China Petroleum Group Northeast Refining and Chemical Engineering Company Limited. Sinopec's petrochemical design institutes mainly include: Sinopec Engineering & Construction Company Limited (SEI), Sinopec Luoyang (Guangzhou) Engineering Company Limited, Sinopec Shanghai Engineering Company Limited, Sinopec Ningbo Engineering Company Limited, Sinopec Nanjing Engineering Company Limited, under Sinopec Refining & Chemical Engineering (Group) Company Limited (SEG). China Tianchen Engineering Company Limited (Tianjin), Siding Engineering Company Limited (Taiyuan), Donghua Engineering Technology Company Limited (Hefei), China Wuhuan Engineering Company Limited (Wuhan), Hualu Engineering Technology Company Limited (Xi'an), China Chengda Engineering Company Limited (Chengdu) and several other major engineering companies are under the China Chemical Engineering Group (CNCEC).