From 27th to 28th March 2015，the Acceptance Conference of Optical and Near-infrared Solar Eruption Tracer (Onset) developed by NIAOT was held in Kunming city of Yunnan province。The Acceptance Conference was organized by Nanjing University。The Committee of acceptance confirmed that all the design requirements were achieved and first-class solar image at four wavelength band was obtained in the world。Onset was propose by Nanjing University，developed by NIAOT and installed near Fuxian Lake in Yunnan Province。
Solar observation with high space and time resolution can be achieved at four wavelength band (6562.81Å、10830 Å、3600 Å and 4250 Å）through Onset。Onset can simultaneously obtain full disk and partial disk（10＇）solar image at four wavelength band with resolution better than 1＇。
According to different observation mode，data can be obtained (at 6562.81Å line center，blue and red wings；10830Å line center, blue and red wings)。First filter at 10830Å is developed in China meanwhile full disk and partial disk image at 10830Å can be obtained。
In addition，Onset has unique ability for solar image at 3600Å in the world。ONSET is expected to obtain valuable data and contribute significantly to the development of solar physics and space weather.
full disk image at Hα
full disk image at 10830 Å
photo of Committee of acceptance and research staff
Onset（right）installed at Fuxian Lake in Yunnan Province
