Bob Fu, president of China Aid, will tell members of the Congressional-Executive Commission on China that the US needs to push China to uphold religious freedoms more than it does.
Mr Fu has said the Chinese government has completely demolished or removed the crosses of thousands of churches since 2012, and imprisoned at least hundreds of believers.
Churches in China are illegal without state permission, leading many Christians to worship in secret.
According to a government website, the Congressional-Executive Commission on China was created "to monitor human rights and the development of the rule of law in China, and to submit an annual report to the President and the Congress."
It is to hold a hearing on Thursday called "Religion With Chinese Characteristics: Persecution and Control in Xi Jinping's China", with Bob Fu one of several human rights activists invited to testify.
The aim of the hearing is to examine the specific things the Chinese government is doing to suppress Christianity and other faith groups, and to produce recommendations for improving religious freedom in the country.
The Chinese President, Xi Jinping, is scheduled to visit the US in September, where it's possible human rights will be one of the main discussion points.
The Commission said on its website: "The Communist Party continues to see religious groups as a potential threat, needing to be managed, controlled, or crushed. In fact, the Party issued guidelines in May prohibiting religious believers as members.
"No faith group is exempt from state control... In the past year, crosses on Christian churches were torn down reportedly because they attracted too much attention.
"In short, religious freedom restrictions are pervasive and widespread, affecting all of China's diverse faith communities."
