The instruments of Sichuan Branch in China are mainly used and exported in Southwest China, and the testing of natural gas chemical industry is relatively acceptable, while others are not flattering, mainly due to insufficient brand promotion. At present, the mainstream analytical instruments in China are products from Beijing, Shanghai and Zhejiang, and most domestic R&D capabilities are relatively average. Do not consider low-priced after-sales service. Selling cheaply means that after-sales service is unwilling to do it yourself. As long as there are funds and technicians, it is recommended to consider foreign brands first and domestic brands first. Analytical instruments mainly need data. If it is cheap to repair unreliable data all day, it is another matter to only configure instruments to meet the national standard requirements. According to the experience of 10 years, the maintenance of analytical instruments abroad will be used by many people, and the overall cost performance is high. The domestic technology gap is still very large.