The Communist Party newpaper Pravda today said West Germans are increasingly concerned that improved ties with the Eastern bloc could suffer if Bonn joins in the American reprisals against the Afghanistan invasion.

The paper's Bonn reporter declared that important "business circles" in West Germany, the Soviet Union's chief capitalist trade partner, "voice growing concern over Washington's attempts to impose upon its West European allies political and economic actions directed against the U.S.S.R."

About 20 percent of all Soviet imports from capitalist countries come from West Germany and the Germans in 1978 held a surplus of about $1 billion in that trade, according to Soviet figures.

The Soviets have made no mention of Chancellor Helmut Schmidt's assurances to President Carter that Bonn intends to back the White House reprisals, even though the NATO allies two days ago agreed not to reduce their own trade with the Russians. The report was filed before Schmidt's foreign policy speech today.

Pravda said, "The ruling coalition links its chances in the coming election with the sucesses of the 10-year-old policy of detente in Europe." Ever since the Dec. 12 NATO decision to base Pershing II missiles in Europe, Moscow has hammered at the theme that Washington wants Europe to take all the risks of intensified nuclear arms buildup. The Soviets have refused to consider theater arms-reduction talks until the NATO descision is rescinded.

Pravda said West German anxieties over the missile plan and the Afghanistan reprisal moves "are a direct consequence of the departure of the American administration from the course of detente, sliding to dangerous political adventurism."

Meanwhile, Soviet media commentary has expanded on the threat of a possible U.S. led Olympic boycott. The official Tass news agency quoted Olympic chief Lord Killanin as reaffirming that the international committee "regarded the transfer of the 1980 Olympics to any other country as practically impossible at this stage." The press and television also are quoting foreign athletes and Olympic officials to the same effect.

The Soviets disclosed today they have just completed a two-day "working meeting" on the Olympics with the Eastern bloc, Vietnam, Cuba and Mongolia to "exchange opinions" on the 1980 games.

Soviet sources asserted privately that the Soviets told their allies they are not worried about a boycott, which could cut deep into Moscow's intense preparations to showcase the communist way of life. Tass said the meeting was devoted to "questions of information work."