ISLAMABAD, PAKISTAN, FEB. 23 -- After two weeks of argument and debate, the seven-party Afghan guerrilla alliance proposed today a transitional government in Kabul that would allow participation by some members of the current, Soviet-backed administration.

In a communique issued in the Pakistani border city of Peshawar, the alliance proposed a two-tiered, guerrilla-dominated interim administration that would hand over power to an elected government within months of the last Soviet soldier leaving Afghan soil.

The top tier would be a supreme council, consisting of the leaders of the seven mujaheddin resistance groups. The second tier would be a 28-member transitional government, which, according to the communique, would represent "all factions of the Afghan nation."

No names have been mentioned, but half of this Cabinet would be drawn from the resistance, while the other half would consist of refugees and "Moslems presently living in Afghanistan."

That last phrase appears to refer, euphemistically, to the inclusion of some of the less controversial members of the Soviet-backed Afghan government.

After the communique was issued, however, the rebel alliance's chairman, Yunis Khalis, cast doubt on whether the guerrillas are really prepared for power sharing. "If we accepted a coalition with the communists after nine years of fighting," he said, "what was the purpose of our jihad {holy war}?"

Nevertheless, the guerrilla proposal represents a step forward. For the first time, the alliance has implicitly recognized the Geneva peace talks between the Afghan and Pakistani governments, which until now it has denounced. The new transitional government, it says, should be established before a Geneva treaty is signed, and should become a signatory to the accords.

The transitional government would ensure a cease-fire to permit the safe withdrawal of Soviet troops and the return of more than 4 million refugees living in Pakistan and Iran. Within six months of the withdrawal, it would hold general elections for a constituent assembly. In the future, the country would be known as the Islamic State of Afghanistan.

In addition to the two top tiers, there would be a consultative council to frame interim regulations, an autonomous election commission and administrative councils in all 28 provinces.

The alliance also announced the immediate establishment of a Reconstruction Commission. It wants all countries, particularly the Soviet Union, to participate generously in rebuilding Afghanistan's economic infrastructure.

The guerrilla alliance has been under tremendous pressure from Pakistan to come up with a detailed proposal for an interim government that can be presented to the U.N. special representative on Afghanistan, Diego Cordovez, when the peace talks resume in Geneva on March 2. Although eager to conclude a settlement, Pakistan is worried that the refugees will not return home unless the present regime in Kabul has been replaced. Islamabad has strongly hinted that it will not sign an agreement in Geneva until a coalition government has first been established.