I want to take mtr from Longhua to the nearest mtr station and then take which bus to Minsk world

You can catch subway Longhua Line to Convention & Exhibition Center MTR Station, where you can transfer to subway Luobao Line and get off at Luohu. At Luohu Railway Station, the bus no. 205 or 387 can take you to Mamiaojie Menlou Station, from where you can reach your destination by walking about 200m.