Several black appointees in the Reagan administration said this week that the White House has written off blacks politically for the 1984 campaign.

They cited as one example the fact that the White House office of public liaison has had no one dealing with blacks for more than two months.

One senior White House official said the administration has decided that no effort in the next 17 months would be sufficient to moderate the opposition of blacks to President Reagan and capture a sufficient amount of the black vote.

He said most of the White House staff, including Faith Ryan Whittlesey, assistant to the president for public liaison, have made the same assessment.

Whittlesey's public liaison office, which is preparing a political operation to try to win key blue-collar, female and ethnic votes for President Reagan in 1984, also has had no representative to Hispanics since she took over the office in March.

Whittlesey said this week that the absence of blacks and Hispanics on her staff is only temporary and said allegations that she personally advocates ignoring black voters are "ridiculous."

Whittlesey said Mel Bradley, a black special assistant to the president for policy development, will join her office soon and part of his responsibility will be liaison with blacks.

She said no decision has been made on a liaison with Hispanics.

In talks with The Washington Post, about a half dozen black appointees in the Reagan administration said Whittlesey has argued that there is little political benefit for the president in dealing with blacks. They declined to speak on the record for fear of recriminations by the administration.

Several pointed to Whittlesey's public fights with the NAACP in Chester County, Pa., when she was a county official who opposed government aid for day-care facilities and was a critic of county welfare policies.

"Faith Whittlesey has a shrewd, tough intelligence but she uses it to the disadvantage of the poor and needy and most of the poor and needy here were black," said Mary Edwards, a board member of the Chester NAACP.

Whittlesey, who fired six members of the liaison staff--including a black and a Hispanic--the day after taking over the office, has hired all whites so far, mostly women.

Administration officials, troubled by opinion polls that show Reagan with a lower approval rating with women than men, have made female voters a priority for 1984.

Two of the women hired by Whittlesey have been assigned to deal with women's issues, assuming primary responsiblity for that area from Dee Jepsen, the wife of Sen. Roger W. Jepsen (R-Iowa).

"Whittlesey has argued that they can make peace with women in time for the election, but she told them there is nothing they can gain by patching up with blacks," said one black appointee. "She wants us out. Mel Bradley is a band-aid, he's being the good soldier so they'll have a black face . . . that's all it is."

"That's absurd," Whittlesey responded. "The goal of the president is to unify all groups, to deal with minorities . . . there will be a second round of hiring. Our first concern was to get top women on the staff."

Vice President Bush said last week that he doubts that the Republican Party or the administration can win a significant portion of the increasing number of blacks registering to vote in 1984.

"All we can do is make the economic argument that a strong economy will help everyone, rich and poor, black and white," a senior administration official said yesterday. "That hasn't worked so far and every poll I've seen shows it hasn't got much of a chance of working."

He added that Reagan will not be "racist or antagonistic" toward blacks but sees no need to "play to that audience."

Bradley, who will be the liaison to blacks, entered the Reagan adminstration as a senior policy adviser who said he did not want to be identified as the black in the administration or exclusively handle black issues.

However, last April, as the president's standing with blacks sank from an already low level, Bradley was named a special assistant to the president and empowered to attend all Cabinet Council meetings to bring a "black perspective" to all admininistration decision-making.

Despite Bradley's promotion, leaders of black groups continue to complain that there is no contact for them in the Reagan White House.