A man who commandeered a Lufthansa 727 jetliner and forced it to land here surrendered last night.

The man, who said he was disturbed about nuclear energy, poor children and militarism, hijacked the West German jetliner as it flew from Frankfurt to Bonn. He demanded to speak to West German Chancellor Helmut Schmidt. After reading a manifesto to authorities by radio he released the 124 passengers.

Four of the eight crew members were released with the passengers, the other four were freed about five hours later.

Ham radio operators who listened in on communications between the cockpit and the tower at Bonn-Cologne airport said the hijacker demanded that the West German government hold a referendum on the use of nuclear energy, introduce better living conditions for children, and abolish the armed forces.

"All I want is a humane world in which it is worthwhile to live," he was quoted as saying. He complained that ex-convicts are marked for life because of certain entries in their identification documents.

Negotiations with the hijacker were conducted from the tower by Schmidt's top aide, Hans-Juergen Wischenewski, but the chancellor apparently remained at his Bonn office.

It was not known where the hijacker boarded the flight. Lufthansa officials said both the passengers who boarded in Frankfurt and the few who were continuing on to Bonn-Cologne from Aris, were the flight originated, had undergone security checks.

Lufthansa officials said most of the passengers were businessmen planning to attend a food fair in Cologne.