2017 Guolin presided over the formulation of "Technical Requirements for Ozone Generator for Water Treatment" national standard.

2016-06 Guolin, as the undertaking unit of the national "12th Five Year Plan" water special project, participated in the national 12th Five Year Plan scientific and technological innovation achievement exhibition and was reviewed by national leaders.

2015-07 Guolin was listed on the new third board, stock abbreviation: Guolin environmental protection, stock code: 832938.

2014-11-17 Guolin finished the second stage production base with 55000square meters. Until now, Guolin has the largest ozone production base in the world with total 88800 square meters (area of structure: 54000 square meters), which is the world's leading specialized ozone equipment production base.

2012-06 The "large (120kg/h) ozone generator" project independently developed by our company has passed the evaluation of scientific and technological achievements of the Ministry of Housing and Urban-Rural Development of the People’s Republic of China (MOHURD).

2012-10  Guolin won the bidding of Shi Jiazhuang Qiaodong Waste Water Plant with 5 sets of 120kg/h ozone system project for 600,000.00m3/day waste water treatment and become the largest ozone system used in water treatment project in the world.

2012-11 Guolin won the honorary title of "key high tech enterprise of national Torch Plan".

2011-10-23 Guolin restructured into incorporated company.

2011-10 First stage Guolin ozone equipment production base with 33000 square meters area officially put into operation.

2011-11-13 Guolin won the bidding of Shanghai Petrochemical catalytic cracking catalyst of heavy oil project with 5 sets of 80kg/h ozone system. This is the biggest ozone system applied in flue gas denitrification industry in the world.

2010-06-01 Industrial standard “Ozone Generator for Water Treatment” CJ/T322-2010 mainly edited by Guolin put into force in nationwide.

2000-02-01“Double cooling ozone generation tank” researched and developed independently by Guolin was obtained National Utility New Model Patent（ZL99 2 47355.1）

1994-12-13 Qingdao Guolin industry Co., Ltd. was founded.