My bedroom's door is exactly opposite to my flat's door...
It is very bad fung shui...
How to improve it?

Emily, for feng shui, it really depends on your flat's door, the building door, and the bedroom door. You need an exact measurement to judge whether it is good or bad. No one can predict that it is negative just because your flat door is opposite the bedroom door.

Rgds,

Hailung

兩邊都掛長珠簾，這樣子可以擋一陣子吧^^
至於材質問題，可以考慮用水晶的，因為據很多玩水晶的人說，水晶的氣場比其他的材質好^^
我個人是認為應該是採用天然材質的就可以了。