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the problem read S0BUF to A ,use 89LPC952

when i use the 89LPC952 serial port 0,the below interrupt response program is work unnormal.
if ( S0BUF == '#'){
s0_input_flag = 1;
P2 |= 0x08;
S0_in_char_n = 0;
RI_0 = 0;
goto out1;
} but when i use the serial port 1,the reslut is ok 90FFB4 MOV DPTR,#0xFFB4 74D2 MOV A,#RTCH(0xD2) F0 MOVX @DPTR,A
when i debug the source find the S0BUF content not send to the A ,it is alway 0. E599 MOV A,S0BUF(0x99) B423FB CJNE A,#0x23,C:0030
sfr setting is
S0CON = 0x40;
BRGR0_0 = 0xD2;
BRGR1_0 = 0x04;
BRGCON_0 = 0x03;

S1CON = 0x50;
BRG0_1 = 0xD2;
BRG1_1 = 0x04;
BRGCON_1 = 0x03;

how can i get the S0BUF correctly?