Shandong Lanjing Energy Saving lechnology Co.,LTD was established in 2017,located in Zibo City,Shandong Province,China. Weare engaged in the deep processing of aluminum doors and windows,curtain wall system and hard-ware accessories,as well ase-commerce,software development and technical services,etc.We are one of the most important manufacturers and exporters of doorsand windows in China.