Evangelist Billy Graham said this week that he has been invited to China and that he will take advantage of the invitation to explain Christianity rather than going in his traditional role of evangelist.

"I think to limit my ministry on that first trip to universities and the Academy of Sciences to explain Christianity, and not to preach it," he told a concluding news conference at his nine-day international conference for evangelists in Amsterdam.

Graham also announced that he plans to hold a worldwide crusade, probably in 1989, to be carried live by television satellite to cities around the world. He said he would like to hold the crusade in London. Curran Ouster Sought

More than 30 Roman Catholic theologians, protesting a resolution by the Catholic Theological Society of America in support of the Rev. Charles Curran, have issued their own statement calling for his ouster from Catholic University's theology faculty.

Curran is under orders by the Vatican's Congregation for the Doctrine of the Faith to give up beliefs that differ in some respects from official church doctrine on certain areas of sexual ethics. Curran, maintaining that his dissent deals with noninfallible matters, has refused.

The dissenting theologians, coordinated by Curran's fellow-Catholic University theologian, William E. May, assert that "the type of dissent defended by Father Curran and his supporters undermines the authority" given by Christ to the pope and the church's bishops.

"We therefore believe that for the good of Roman Catholic theology, Catholic higher education and the Catholic church in North America action be taken that would prohibit Father Curran from teaching theology" at Catholic University, they said. Cult Aides Get Prison

The former top aide to Bhagwan Shree Rajneesh, Sheela P. Silverman or Ma Anand Sheela, as she was known in the now-defunct cult, was sentenced by an Oregon court to 4 1/2 years in prison for causing a salmonella outbreak in Wasco County and for wiretapping.

In a plea bargaining agreement she also admitted immigration fraud, conspiracy to defraud the United States government, the attempted poisoning of Rajneesh's personal physician and two other persons, and arson.

Another aide, Katherine J. Elsea, was sentenced to 10 years for trying to murder Rajneesh's physician by adrenaline injections. A third aide received a 4 1/2-year sentence for involvement with the salmonella and wiretapping charges.