As a state-holding enterprise , Beijing Square  Engineering &Technology  Co.,Ltd  was established in 1985, and affiliated to Beijing Automotive Industry Corp, which ranks among the world?s top 500 enterprises (ranks 366th) .
In the field of water-saving irrigation equipment,the company, integrating research, design,development with sale, and project construction? is a high-tech enterprises. As the deputy director of the Irrigation Equipment branch of Chinese Hydraulic Engineering Association ?the company has been awarded  the title of A2 qualification enterprise (the highest qualification certificate of irrigation enterprises).
The company has been awarded  AAA credit rating certificate by Shanghai Pu Dong Development Bank.it has the independent import and export right.Its subsidiary in Shan Xi has the III qualifications in general contracting of water conservancy and hydropower construction  and II qualification in computer information system integration.
Now the company has two production bases in Beijing and Shan xi province. Both of them are able to produce more than 20 series of water-saving irrigation products and fittings in large-scale, such as PE pipe/PE Tubing for farmland irrigation,Drip Tape with Flat Dripper, Drip Pipe with Cylindrical Dripper, Drip Belt with Single wing labyrinth flow-path,filter and irrigation information system.the irrigation equipment of Erun  was the  national earliest agricultural machinery that was promoted, and Erun products have all been inspected by the  National Quality Inspection Center of Agricultural Irrigation and Drainage Equipment.
Now the  annual output has reached 250000000 meters long of the drip belt (tubing) and  2500 tons of pipe. The company's products and ser