Rui Jun started taking erhu lessons from Ms Wang Jing in 2007. In 2009 he continued his studies under the tutelage of Ms Shen Qin, and obtained a Grade 8 Certificate of Distinction in the graded examination conducted by the Central Conservatory of Music in the same year. He obtained his Grade 9 Certificate of Distinction the following year, and his Diploma Certificate in 2016. Rui Jun is currently under the guidance of Mr Li Bao Shun, concertmaster of the Singapore Chinese Orchestra, and has also learnt the jinghu from Mr Guo Si Quan.
Rui Jun has also performed in the capacity of a soloist over the years as well. Having participated in the productions of many different organisations, he has performed concertos such as the erhu double concerto “Hymn of Wusuli”, the erhu concerto “Admirable Spirits of the Snow Mountains”, the gaohu concerto “The Butterfly Lovers”, as well as the jinghu concerto “A Deep Night”. He is also active in the promotion of new solo works as well, such as the premiering of new works in the Instrumental Concert 2018, held by the Association of Composers.
An active leader in the organizations he participates in, Rui Jun was the Chairman and Erhu I Principal of the Raffles Institution Chinese Orchestra (Year 1 – 4 Section) in 2010. In 2012 he took on the role of Huqin Sectional Leader of its Year 5 – 6 counterpart. After joining the Raffles Alumni Chinese Orchestra (RACO) in 2010, Rui Jun served in the capacity of Huqin Sectional Leader in 2014, and assumed the role of co-conductor since 2016. Rui Jun was also the Chairperson of the Ding Yi Youth Ensemble from 2015 to 2016. Joining the Singapore Management University Chinese Orchestra in 2015, Rui Jun served as its President in 2016, and Honorary General Secretary in 2017.