President Carter's chief domestic adviser, Stuart Eizenstat, said yesterday that the administration will use its proposed jobs program to improve the nation's parks and wilderness areas.

"It's no secret that the parks and wildlife refuges are woefully neglected," Eizenstat told a conference of environmental leaders on Capitol Hill.

"We understand that 12,000 more full time employees in the National Park Service could do a remarkable job and we intend to focus public employment in part in the environmental area and the national parks."

Carter has asked Congress for $1.7 billion in fiscal 1978 to create about 760,000 public service jobs.

Eizenstat also said the new administration will work to prevent oil spills, increase environmental and economic control over offshore oil leasing, revamp the national historic preservation program, pass a stripmine bill and enforce pollution control laws.

More than 200 environmental leaders, congressional aides and industry representatives from around the country attended the conference sponsored by the Rockefeller Brothers Fund to publicilze a new report entitled "The Unifinished Agenda."

The 184-page report was drafted by a task force of the leaders of the 12 largest environmental organizations with a nationwide membership of 4.3 million.

Combining papers of 63 environmental experts, the report presented a consensus on such issues as energy, pollution abatement, population growth, natural resources, ecological systems, threats from toxic chemicals and genetic engineering.

Its 75 recommendations include:

A halt to "subsidies to nuclear industries" and a phaseout of existing nuclear energy plants. "Nuclear fission" it contends, "is rapidly dying as an energy option because of its high capital, environmental, social and energy costs."

A progressively increasing gasoline tax, the proceeds of which should be used to begin reducing the ill effects of automobiles."

An allout effort . . . to eliminate the single most significant cause of human cancer - tobacco smoke."

Strict controls over genetic research that could create new life forms and endanger human health.

Former Environmental Protection Agency Administrator Russell E. Train told the group he fears "the environment is going to be in for a very tough time" because of the difficult economic situation, energy shortages and "the big freeze of 1977."

Train said the Carter administration has approved the EPA budget submitted by former President Ford "which is totally inadequate to do the job EPA is mandated to do by Congress." The EPA has appealed to the Office of Management and Budget for more funds.

"The agency is spread so thin, it is practically impossible to live up to public expectations," Train said. The EPA which now employs 9,500 people on a budget of about $800 million, needs an additional $350 million and 2,500 positions to enforce water pollution, solid waste and toxic chemical legislation, he said.

"The Unfinished Agenda" task force included leaders from the Natural Resources Defense Council, Friends of the Earth. The Wilderness Society, National Wildlife Federation, Zero Population Growth, National and Massachusetts Audubon Societies, the Nature Conserrvancy, Environmental Defense Fund, Izaac Walton League, National Parks and Conservation Association, and the Sierra Club.