Wang made the allegations on micro-blogging platform Sina Weibo on Nov 23.
She also alleged Sun had abused his power for private gain, and helped people to fake retirement documents to receive pensions, sold public property at low prices and helped his relatives make illicit gains.
The Party discipline inspection committee in Shuangcheng decided to investigate Sun after Wang wrote the post. They later found Sun had violated rules in his handling of State assets. Sun was also found to have used his power to help fake retirement documents for Wang's mother.
The Shuangcheng government announced on its micro blog on Monday that Sun had been removed from his posts as a manager of Shuangcheng Industry Corp and deputy to the city people's congress.
The discipline committee said Wang's allegations that Sun has been pressuring her to maintain a sexual relationship with him and forced her into sexual intercourse, including when she was seven months pregnant, could not be confirmed, as Wang could not be reached to assist with the investigation.