dear shr,
thanks for your quick reply, still i am not clear with following cases,
OCC LOAD for branch(red colour),
Which cases for branch is right, a) or b), according to your relpy, a) should be choosed, but still I think b) is also right because in this case ,occ load have considerded the ope load.
please shed some light on me, thanks!

a)
1 WW+HP+D11 HYD D11
2 W+T1+D1+P1 OPE design temp D1
3 W+T2+D2+P1 OPE ope temp D2
4 W+T3+D3+P1 OPE mini temp D3
5 W+P1+D4 SUS D4
6 W+T2+P1+D5+WIN1 OPE D5
7 W+T2+P1+D6+WIN2 OPE D6
8 W+T2+P1+D7+U1 OPE D7
9 W+T2+P1+D8-U1 OPE D8
10 W+T2+P1+D9+U2 OPE D9
11 W+T2+P1+D10-U2 OPE D10
b)
1 WW+HP+D11 HYD D11
2 W+T1+D1+P1 OPE design temp D1
3 W+T2+D2+P1 OPE ope temp D2
4 W+T3+D3+P1 OPE mini temp D3
5 W+P1+D4 SUS D4
6 W+T2+P1+D2+WIN1
7 W+T2+P1+D2+WIN2
8 W+T2+P1+D2+U1
9 W+T2+P1+D2-U1
10 W+T2+P1+D2+U2
11 W+T2+P1+D2-U2