It seems like you're writing a story! So, I'll correct it, and try to make it sound more comfortable in the style of a story.

The boy I met in my dream

That It was a hot day, I can't remember the definite date.
In that dream, when I realised that I was having dream, I'd been standing outside of the Hakka Earth Building. I looked up at the eaves, which was were about 10 meters above the earth, against the crimson sky. It might be nightfall.
Suddenly, I was standing in the building. But now, I can only see the rounded sky, just like a black hole. Many red lanterns were hung on in every corridor. I saw many women in colourful clothes passing by on every floor. They might not notice me. I watched they them fetching water from the well, carrying babies from the rooms, just like their daily activities.
A memorable atmosphere pervaded the air.
Twilight reflected from the claret wall through the window. (You would say reflected from, because reflecting is when light returns back from something, like a mirror. I think here, it might be better to say something like "the light illuminated the claret wall through the window)
I felt like that I had been there before.
"Wency?"
I heard someone calling me rearward.
And I turned around, only to found the busy women passing by.
I looked down at the soaking floor tiles. There was only my shadow.
I didn't know why but I was sure that he was a boy with a gentle voice, just like he had known me.
I walked forward the gate,slowly, I walked slowly toward the gate. even I could I could even smell the flavor from those women's kitchen. I'm sure I had walked in that way before, and the boy's voice continued.
"Wency,Wency?" sounds it sounded like he wanted me to have a look at him, but every time I turned around, there was no one except the women and their babies.
His voice got close to me. I feel felt like he was standing right behind me without distance with no distance between us.
I feel felt something forced me to push the gate, I didn't want to do like that though.
When I felt the twilight through the crevice of the door was pretty dazzling, he shouted:
"Why don't you wait for me!"
"I can't see you!", I shouted as I blocked the light with my hand.
"I have waited for you for -----times!"
"What time? What did you say..." I wanted to turn back again, but something was sucking me out of the gate.
"Only you can't see me! Every time!"
"I don't know..." as I turned around, I just saw a boy standing alone in the shade. I couldn't see his face clearly.
He had beautiful silver hair. But he was lonesome against the light.
As I tried to get closer, I woke up.
The only thing I could see was just the blank ceiling and the bright early light.


Maybe we'll meet again next time.
At that time, it's my turn to call your name.

Most of your English mistakes were made because you didn't always use the correct tense. You were writing about something that happened in the past, but some of the verbs you used were written in the present tense instead. Your English is very good though! I could understand the story very well and found it interesting.

The boy I met in my dream

That was a hot day,I can't remember the definite date.
In that dream,when I realised that I was having dream,I'd been standing out of the Hakka Earth Building.I look up at the eaves,which was about 10 meters above the earth,against the crimson sky.It might be nightfull.
Suddenly,I was standing in the building.But now, I can only see the rounded sky,just like a black hole.Many red lanterns were hung on every corridor.I saw many women in colourful clothes passing by on every floor.They might not notice me.I watched they fetching water from the well,carrying babies from the rooms,just like daily.
Memerable atmosphere pervaded the air.
Twilight reflexed on the claret wall through the window.
I felt like that I had been there before.
"Wency?"
I heard someone calling me rearward.
And I terned around,only to found the busy women passing by.
I looked down at the soaking floor tiles.There was only my shadow.
I didn't know why but I was sure that he was a boy with a gentle voice,just like he had known me.
I walked forward the gate,slowly,even I could smell the flavor from those women's kitchen.I'm sure I had walked in that way before,and the boy's voice continued.
"Wency,Wency?'sounds like he wanted me to have a look at him,but evevy time I turned around,there was no one except the women and their babies.
His voice got close to me.I feel he was standing right behind me without distance.
I feel something forced me push the gate,I didn't want to do like that though.
When I felt the twilight through the crevice of the door was pretty dazzling,he shouted:
"Why don't you wait me!"
"I can't see you!",I blocked the light with hand.
"I have been waiting for you for -----times!"
"What time?What did you say..."I wanted to turn back again,but something was sucting me out of the gate.
"Only you can't see me!Every time!"
"I don't know..."as I tuned round,I just saw a boy standing alone in the shade.I can't see his face clearly.
He has beautiful silver hair.But his shadowwas lonesome against the light.
As I tried to get closer,I waked.
The only thing I can see was just the blank ceiling and the bright early light.


Maybe we'll meet again next time.
At that time,it's my turn to call your name.