The Dalton administration said today that social programs that aid the poor in Virginia will bear the brunt of federal spending cuts proposed by President Reagan and predicted layoffs among state employes to meet funding losses that could total $702.7 million by mid-1984.

Appearing before the House Appropriations Committee, state budget executive Charles B. Walker reaffirmed earlier statements by Gov. John N. Dalton that the administration would seek no new taxes to offset losses to federal aid expected to amount to nearly $494 million in social services.

While state officials played down the impact of the cuts, public interest groups disagreed, testifying they would have a profound effect on the state's Medicaid program, CETA jobs, and such programs as aid to crippled children and the mentally ill.

"This is totally consistent with Gov. Dalton's past policies," said Chan Kendrick, state director of the American Civil Liberties Union."It again hits those individuals who are least able to fight back -- the individuals at the lower echelons of our society."

Dalton, who has complained repeatedly about welfare costs during his first three years in office, last year drew criticism when he withdrew the state from a $1 million federal program that provided assistance for some mentally disabled Virginians.

According to preliminary state estimates, the proposed Reagan budget cuts would reduce federal payments to Virginia by about 7.5 percent through mid-1982, and 15 percent during the 1982-84 accounting period. Federal education funding to the state is expected to be cut by up to $109 million by mid-1984, with the biggest reductions coming in elementary and secondary education programs and school lunches.