You can choose "Moonlit Night of Spring River", the mood and meaning are very good.
Other suitable guzheng music for weddings:
Phoenix
Colorful Clouds Chasing the Moon
Wedding March
Wish for a Human Heart
Flowering Goodness and Moonlight
Fisherman Singing in the Evening
What is suitable for weddings? Expanded Information: Spring River, Moonlit Night was originally a traditional Chinese pipa piece. The name of the piece is Sunset xiao drum (also known as Sunset xiao song, also known as Xunyang pipa, Xunyang night moon, Xunyang song). Around 1925, this song was first adapted into a national orchestral music. After liberation, and by a number of people to organize the adaptation, more perfect, y cherished by domestic and foreign listeners. The Moonlit Night of Spring River has also become a famous piece for guzheng, in A key. It is a very beautiful and elegant piece, with a rhythmic, soft and watery tone. The whole piece consists of an introduction, a theme section, eight variations on the theme and a coda, which is a unique variation. It is a unique variation of the theme, which is based on a theme section, and the other sections are varied by various variations, which enriches the musical expression and advances the development of the music. This technique is good at being delicate and profound, revealing the theme content and shaping the musical image from different moods and perspectives. Through the beautiful and simple lyrical melody, smooth and full of changes in rhythm, colorful playing techniques, like a moving scroll landscape painting, aptly expressed the poetic mood of the music. References:
Baidu Encyclopedia - The Moonlit Night of Spring River Guzheng Song