1)如果用老公的EAD去找工作,万一485被拒,我能不能再换成H1.
Right! You can not change into H1 in US.
2) 如果用OPT去找工作,会不会影响我的绿卡申请。
I doubt if you can get OPT if you have ted I-485. You can find a job first. Just apply H1 directly without using EAD (if non-profit). It is the best way.