Troubles Occurred When Programming PIC18F25K8

Good day~everybody

I met some troubles when I working in the program about EEPROM of PIC18F25K8.( the datasheet of PIC18F25K8 )

Firstly I think I need to explain to you that my English is so terrible,so any inconvenience in language please forgive me.
Let’s go into the subject.
I read and wrote the EEPROM of PIC18F25K80 according to the routine.In the situation of simulation,I feel the reading and writing is normal( the value is right). However,there are two problems.
3). The data can’t change as following my writing when I see MPLAB in the situation of simulation. This is odd!
4). I found tha EEPROM was reset after power down!

Before that I guess that the data I wrote didn’t save in the EEPROM.However,the following program which is read,very simple but what it shows is different from MPLAB’s.
unsigned char EE_Read (unsigned char EE_Address)

{
        EEADR = EE_Address;
        EEADRH = 0;
        EECON1bits.EEPGD = 0;
        EECON1bits.RD = 1;
        return EEDATA;
        }

This is the program I wrote which referring the others’ routine.

void EE_Write (unsigned char EE_Address, unsigned char EE_Data)
{
//*************************************************
//*single bytes EEPRO write program
//*address：EE_Address  
//*data：EE_Data
//*************************************************

        PIR4bits.EEIF = 0;
        EEADR = EE_Address;
        EEADRH = 0;
        EEDATA = EE_Data;
        EECON1bits.EEPGD = 0;
        EECON1bits.WREN = 1;
        INTCONbits.GIE = 0;

        _asm
                MOVLW        0X55

Please help me solve problems!

Best regards~