"融洽相处" (róng qiá xiāng chǔ) is a Chinese phrase that can be translated as "get along well" or "have a harmonious relationship." In Engpsh, you could say "get along harmoniously" or "have a harmonious relationship." For example:

"I'm happy to see that you two are getting along harmoniously."
"It's important for a healthy relationship to have a harmonious dynamic."