diff --git a/kernel/fork.c b/kernel/fork.c
index e9a285a..0b213f0 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -74,11 +74,19 @@ static int fork_mem_cpy(u32 ppid, u32 pid)
 	// 复制代码，代码是共享的，直接将物理地址挂载在子进程的页表上
 	for (addr_lin = p_proc_current->task.memmap.text_lin_base; addr_lin < p_proc_current->task.memmap.text_lin_limit; addr_lin += num_4K)
 	{
-		lin_mapping_phy(addr_lin,						   // 线性地址
-						get_page_phy_addr(ppid, addr_lin), // 物理地址，为MAX_UNSIGNED_INT时，由该函数自动分配物理内存
-						pid,							   // 要挂载的进程的pid，子进程的pid
-						PG_P | PG_USU | PG_RWW,			   // 页目录属性，一般都为可读写
-						PG_P | PG_USU | PG_RWR);		   // 页表属性，代码是只读的
+		// lin_mapping_phy(addr_lin,						   // 线性地址
+		// 				get_page_phy_addr(ppid, addr_lin), // 物理地址，为MAX_UNSIGNED_INT时，由该函数自动分配物理内存
+		// 				pid,							   // 要挂载的进程的pid，子进程的pid
+		// 				PG_P | PG_USU | PG_RWW,			   // 页目录属性，一般都为可读写
+		// 				PG_P | PG_USU | PG_RWR);		   // 页表属性，代码是只读的
+		lin_mapping_phy(SharePageBase, 0, ppid, PG_P | PG_USU | PG_RWW, 0);										// 使用前必须清除这个物理页映射
+		lin_mapping_phy(SharePageBase, MAX_UNSIGNED_INT, ppid, PG_P | PG_USU | PG_RWW, PG_P | PG_USU | PG_RWW); // 利用父进程的共享页申请物理页
+		memcpy((void *)SharePageBase, (void *)(addr_lin & 0xFFFFF000), num_4K);									// 将数据复制到物理页上,注意这个地方是强制一页一页复制的
+		lin_mapping_phy(addr_lin,																				// 线性地址
+						get_page_phy_addr(ppid, SharePageBase),													// 物理地址，获取共享页的物理地址，填进子进程页表
+						pid,																					// 要挂载的进程的pid，子进程的pid
+						PG_P | PG_USU | PG_RWW,																	// 页目录属性，一般都为可读写
+						PG_P | PG_USU | PG_RWW);																// 页表属性，数据是可读写的
 	}
 	// 复制数据，数据不共享，子进程需要申请物理地址，并复制过来
 	for (addr_lin = p_proc_current->task.memmap.data_lin_base; addr_lin < p_proc_current->task.memmap.data_lin_limit; addr_lin += num_4K)
diff --git a/kernel/serialport.c b/kernel/serialport.c
index 6773d36..5a3d39f 100644
--- a/kernel/serialport.c
+++ b/kernel/serialport.c
@@ -21,7 +21,6 @@ void serial_handler(int irq) {
 void serial_tty_init_i(NTTY* tty) {
    serial_buf* sp = (serial_buf*)tty->input_buf;
    sp->buf = (void*)K_PHY2LIN(do_kmalloc(SERIAL_BUF_SIZE));
-   kprintf("%p", sp->buf);
    sp->head = sp->tail = sp->readable = sp->len = 0;
    outb(PORT + 1, 0x01);
    put_irq_handler(RS232_IRQ, serial_handler);
diff --git a/kernel/tty.c b/kernel/tty.c
index 05ab75d..2708e07 100644
--- a/kernel/tty.c
+++ b/kernel/tty.c
@@ -52,13 +52,14 @@ void init_tty_main()
 	tty = (NTTY*)K_PHY2LIN(do_kmalloc(sizeof(NTTY)));
 	tty->driver_type = 2;
 	tty->input_buf = (serial_buf*)K_PHY2LIN(do_kmalloc(sizeof(serial_buf)));
-	kprintf("tty: %p, outbuf: %p\n", tty, tty->input_buf);
+	// kprintf("tty: %p, outbuf: %p\n", tty, tty->input_buf);
 	tty->output_buf = NULL;
 	serial_tty_init_i(tty);
 	serial_tty_init_o(tty);
 	ntty_table[2] = tty;
 	cur_ntty = ntty_table[0];
 	tty_ok = 1;
+	kprintf("TTY initialized\n");
 }
 
 
@@ -96,11 +97,18 @@ void tty_write(NTTY *tty, char *buf, int len)
 		}
 		return;
 	}
-	while (--len >= 0)
-	{
-		vga_tty_write(tty, *buf++);
+	else if (tty->driver_type == 1) {
+		while (--len >= 0)
+		{
+			vga_tty_write(tty, *buf++);
+		}
+		if (cur_ntty == tty) vga_tty_flush(tty);
+	}
+	else if (tty->driver_type == 2) {
+		while(--len >= 0) {
+			serial_tty_write(tty, *buf++);
+		}
 	}
-	if (cur_ntty == tty) vga_tty_flush(tty);
 }
 
 /*****************************************************************************
diff --git a/kernel/vga.c b/kernel/vga.c
index 9d17493..fe8452b 100644
--- a/kernel/vga.c
+++ b/kernel/vga.c
@@ -119,7 +119,6 @@ static inline void vga_flush_blankline(int line_no)
 /*****************************************************************************
  * tty - vga driver
  *****************************************************************************/
-static u16 pagebuf[3][SCR_BUFSIZE];
 
 void vga_tty_init(NTTY *tty)
 {
diff --git a/user/shell_0.c b/user/shell_0.c
index 5691b43..2f66383 100644
--- a/user/shell_0.c
+++ b/user/shell_0.c
@@ -9,9 +9,9 @@
 
 int main(int arg, char *argv[])
 {
-	int stdin = open("dev_tty0", O_RDWR);
-	int stdout = open("dev_tty0", O_RDWR);
-	int stderr = open("dev_tty0", O_RDWR);
+	int stdin = open("dev_tty2", O_RDWR);
+	int stdout = open("dev_tty2", O_RDWR);
+	int stderr = open("dev_tty2", O_RDWR);
 
 	char buf[1024];
 	int pid;